What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?

What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?
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Echinoderms and chordates are deuterostomes, i.e., in their embryonic development the blastopore turns into the anus. All other animals with complete digestive system are protostomes, i.e., their blastopore originates the mouth. The blastopore is the first opening of the digestive tube that appears in the embryonic development. Phylum Echinodermata - Image Diversity: blastopore
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Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly found protochordate species, what is an example of a discovery that would weaken the hypothesis? What is an example of a discovery that would strengthen it?

Description : Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly ... the hypothesis? What is an example of a discovery that would strengthen it?

Last Answer : Hypothesis to be tested: Vertebrates evolved from echinoderms. Testing material: A newly found protochordate species (i.e., a vertebrate forerunner). Example of weakening observation (that ... shows how science works, beginning with the placement of hypothesis and further observational testing.)

Is fecundation in amphibians external or internal? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?

Description : Is fecundation in amphibians external or internal? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?

Last Answer : In the majority of the amphibian species fecundation is external. This feature is common to bony fishes too and it shows that the reproductive system and the embryonic development of ... egg cells. This phenomenon does not characterize internal fecundation since the gametes unite in water.

Are mollusc metameric beings? Exclusively analyzing this feature could it be said that molluscs are evolutionarily proximal to nematodes or to annelids?

Description : Are mollusc metameric beings? Exclusively analyzing this feature could it be said that molluscs are evolutionarily proximal to nematodes or to annelids?

Last Answer : In molluscs there is not a body divided into segments. Considering just this feature it could be said that evolutionarily they are more proximal to nematodes than to annelids.

Echinoderms are closely related to chordates due to the following characters .

Description : Echinoderms are closely related to chordates due to the following characters .

Last Answer : Echinoderms are closely related to chordates due to the following characters . A. Tube- within - ... have mesodermal endoskeleton . D. All of these

Echinoderms and chordates have

Description : Echinoderms and chordates have

Last Answer : Echinoderms and chordates have A. Pseudocoel B. Shizocoelom C. Enterocoelom D. Hemocoel

In which of the following, notochord is present in embryonic stage? (a) All chordates (b) Some chordates (c) Vertebrates (d) Non chordates

Description : In which of the following, notochord is present in embryonic stage? (a) All chordates (b) Some chordates (c) Vertebrates (d) Non chordates

Last Answer : (a) All chordates

What is the morphological characteristic that evolutionarily approximates the beings of the phylum Annelida to arthropods?

Description : What is the morphological characteristic that evolutionarily approximates the beings of the phylum Annelida to arthropods?

Last Answer : The metameric feature, i.e., the body segmentation in metameres, approximates annelids to arthropods since these animals are segmented beings too. (Bristles present in oligochaete and polychaete annelids are also covered with chitin, the same substance of the arthropod exoskeleton.)

The canal system is a characteristic feature of (a) echinoderms (b) sponges (c) helminthes (d) coelenterates.

Description : The canal system is a characteristic feature of (a) echinoderms (b) sponges (c) helminthes (d) coelenterates.

Last Answer : (b) sponges

An important characteristic that Hemichordates share with Chordates is

Description : An important characteristic that Hemichordates share with Chordates is

Last Answer : An important characteristic that Hemichordates share with Chordates is (a) absence of notochord (b) ... gill slits (d) pharynx without gill slits

Important characteristic that hemichordates share with chordates is (a) ventral tubular nerve cord (b) pharynx with gill slits (c) pharynx without gill slits (d) absence of notochord.

Description : Important characteristic that hemichordates share with chordates is (a) ventral tubular nerve cord (b) pharynx with gill slits (c) pharynx without gill slits (d) absence of notochord.

Last Answer : (b) pharynx with gill slits

An important characteristic that Hemichordates share with Chordates is : (1) Ventral tubular nerve cord (2) Pharynx with gill slits (3) Pharynx without gill slits (4) Absence of notochord

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Last Answer : (2) Pharynx with gill slits

Brush border is characteristic of (a) neck of nephron (b) collecting tube (c) proximal convoluted tubule (d) all of these.

Description : Brush border is characteristic of (a) neck of nephron (b) collecting tube (c) proximal convoluted tubule (d) all of these.

Last Answer : (c) proximal convoluted tubule

What ever happened (evolutionarily) to the spikes on the stegasaurus tail?

Description : What ever happened (evolutionarily) to the spikes on the stegasaurus tail?

Last Answer : answer:When the dinosaurs when extinct, there was no need for the next generations of lizards to have this particular defense mechanism. They have other traits that compensate for this type of thing. Some reptiles are ... (I don't know of any) or they wouldn't because it's not necessary to survive.

n the time since E. coli and Salmonella diverged evolutionarily A.there has been little change in either genome B.E. coli has acquired many genes via horizontal transfer C.E, coli has lost approximately 50% of its genome D.none of these

Description : n the time since E. coli and Salmonella diverged evolutionarily A.there has been little change in either genome B.E. coli has acquired many genes via horizontal transfer C.E, coli has lost approximately 50% of its genome D.none of these

Last Answer : C.E, coli has lost approximately 50% of its genome

In the time since E. coli and Salmonella diverged evolutionarily A.there has been little change in either genome B.E. coli has acquired many genes via horizontal transfer C.E, coli has lost approximately 50% of its genome D.none of these

Description : In the time since E. coli and Salmonella diverged evolutionarily A.there has been little change in either genome B.E. coli has acquired many genes via horizontal transfer C.E, coli has lost approximately 50% of its genome D.none of these

Last Answer : C.E, coli has lost approximately 50% of its genome

In the time since E. coli and Salmonella diverged evolutionarily A- there has been little change in either genome B- E. coli has acquired many genes via horizontal transfer C- E, coli has lost approximately 50% of its genome D- none of these

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Last Answer : E, coli has lost approximately 50% of its genome

Which of the following traits is not characteristics of echinoderms ?

Description : Which of the following traits is not characteristics of echinoderms ?

Last Answer : Which of the following traits is not characteristics of echinoderms ? A. Water vascular system B. Trochophore larva C. Tube feet D. Enterocoel

Which of the following statement is incorrect for echinoderms ?

Description : Which of the following statement is incorrect for echinoderms ?

Last Answer : Which of the following statement is incorrect for echinoderms ? A. The most distinctive feature ... D. They have well- developed circulatory system.

Are echinoderms endothermic?

Description : Are echinoderms endothermic?

Last Answer : Yes

Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

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Last Answer : What is the alternative means for transport of substances in animals without a circulatory system? Why is blood important for larger animals?

Echinoderm identity card. How are echinoderms characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Description : Echinoderm identity card. How are echinoderms characterized according to examples of representing beings, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

Last Answer : Examples of representing beings: sea cucumber, sea urchin, starfishes. Basic morphology: calcareous endoskeleton with spines, ambulacral system. Type of symmetry: secondary radial. Germ layers and ... cephalization. Types of reproduction: sexual, with larval stage. Phylum Chordata - Study Here

Is there a larval stage in echinoderms?

Description : Is there a larval stage in echinoderms?

Last Answer : In echinoderms embryonic development is indirect, with ciliated larvae.

Do echinoderms present internal or external fecundation? Is there sex division among individuals?

Description : Do echinoderms present internal or external fecundation? Is there sex division among individuals?

Last Answer : The fecundation in echinoderms is external, gametes are liberated in water where fecundation occurs. The majority of echinoderms are dioecious with male and female individuals.

How are the symmetry and the nervous system characterized in echinoderms?

Description : How are the symmetry and the nervous system characterized in echinoderms?

Last Answer : Adult echinoderms, along with cnidarians, are the animals that present radial symmetry, i.e., their body structures are distributed around a center. The radial symmetry in echinoderms however ... to follow the pentaradial structure of the body. Phylum Echinodermata - Image Diversity: radial symmetry

Do echinoderms have an excretory system? How is excretion done in these animals?

Description : Do echinoderms have an excretory system? How is excretion done in these animals?

Last Answer : Echinoderms do not have an excretory system. Their excretions are eliminated by diffusion.

Do echinoderms have respiratory and circulatory systems?

Description : Do echinoderms have respiratory and circulatory systems?

Last Answer : In echinoderms there are not well-defined respiratory (with the exception of the holothurian group) and circulatory systems. The ambulacral hydrovascular system plays the function of these systems.

What is the type of digestive system of echinoderms?

Description : What is the type of digestive system of echinoderms?

Last Answer : Echinoderms present a complete digestive system, with mouth and anus.

What is the system that permits movement and fixation to echinoderms?

Description : What is the system that permits movement and fixation to echinoderms?

Last Answer : The system that permits movement and fixation to substrates in echinoderms is called the ambulacral system. In these animals water enters through a structure called madreporite, passes through ... emptied by water thus acting as suckers. Phylum Echinodermata - Image Diversity: ambulacral system

How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?

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Last Answer : The echinoderm skeleton is internal, i.e., it is an endoskeleton. It is made of calcium carbonate (calcareous). Vertebrates also have internal skeleton made of bones and cartilages. Arthropods ... of chitin, a chitinous exoskeleton. Some molluscs present a calcareous shell that works as exoskeleton.

What are the basic morphological features of echinoderms?

Description : What are the basic morphological features of echinoderms?

Last Answer : Echinoderms, as the name indicates (echino = spiny, derma = skin), are creatures with spines originated from an endoskeleton. Their endoskeleton is made of calcareous plaques that besides spines ... have pentaradial symmetry; the radial symmetry in these animals is secondary, present only in adults.

Under which environments do echinoderms live?

Description : Under which environments do echinoderms live?

Last Answer : Echinoderms are marine animals, they live in salt water.

Select the taxon mentioned that represents both marine and fresh water species. (a) Echinoderms (b) Ctenophora (c) Cephalochordata (d) Cnidaria

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Last Answer : (d) Cnidaria

Which of the following animals are true coelomates with bilateral symmetry? (a) Adult Echinoderms (b) Aschelminthes (c) Platyhelminthes (d) Annelids

Description : Which of the following animals are true coelomates with bilateral symmetry? (a) Adult Echinoderms (b) Aschelminthes (c) Platyhelminthes (d) Annelids

Last Answer : (d) Annelids

Comparison between Chordates and Non-chordates -Biology

Description : Comparison between Chordates and Non-chordates -Biology

Last Answer : answer:

Comparison between Chordates and Non-chordates -Biology

Description : Comparison between Chordates and Non-chordates -Biology

Last Answer : answer:

how do lower chordates survive on their adaptive features?

Description : how do lower chordates survive on their adaptive features?

Last Answer : echinoderms, cnidaria and other forms

How many of the following chordates have flame cells as exretory organ. Planaria, Ascaris, Amphioxus, Tapeworm, Nereis, Scoliodon.

Description : How many of the following chordates have flame cells as exretory organ. Planaria, Ascaris, Amphioxus, Tapeworm, Nereis, Scoliodon.

Last Answer : How many of the following chordates have flame cells as exretory organ. Planaria, Ascaris, Amphioxus, Tapeworm, ... A. One B. Two C. Three D. Four

In chordates, basically the pharynx is

Description : In chordates, basically the pharynx is

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Which of the following group of characters is present in all chordates in some or other stage in their life or Chordates differ from nonchordates in h

Description : Which of the following group of characters is present in all chordates in some or other stage in their life or Chordates differ from nonchordates in h

Last Answer : Which of the following group of characters is present in all chordates in some or other stage in ... D. Gill slits, vertebral column, and notochord

Which of the following characters is shared by all chordates at some stage of life ?

Description : Which of the following characters is shared by all chordates at some stage of life ?

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Chordates are distingished from non- chordates by the presence of

Description : Chordates are distingished from non- chordates by the presence of

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The distinguishing feature of all chordates is

Description : The distinguishing feature of all chordates is

Last Answer : The distinguishing feature of all chordates is A. A ventrally placed nerve cord B. A water vascular system C. A chitinous exoskeleton D. Notochord

Chordates process

Description : Chordates process

Last Answer : Chordates process A. Dorsal nerve cord placed below gut B. Single hollow nerve cord placed dorsal to ... cord D. Single solid and ventral nerve cord

Name the phylum that forms connecting link between Chordates and Non-chordates.

Description : Name the phylum that forms connecting link between Chordates and Non-chordates.

Last Answer : Name the phylum that forms connecting link between Chordates and Non-chordates.

Which group of chordates possess sucking and circular mouth without jaws?

Description : Which group of chordates possess sucking and circular mouth without jaws?

Last Answer : Which group of chordates possess sucking and circular mouth without jaws?

In some chordates, the notochord is replaced by cartilaginous or bony vertebral column. Name the chordates which possess this character.

Description : In some chordates, the notochord is replaced by cartilaginous or bony vertebral column. Name the chordates which possess this character.

Last Answer : In some chordates, the notochord is replaced by cartilaginous or bony vertebral column. Name the chordates which possess this character.

How do chordates reproduce?

Description : How do chordates reproduce?

Last Answer : Reproduction in beings of the phylum Chordata is sexual, with the exception of urochordates that can also reproduce asexually. In some classes (cyclostomes, osteichthyes fishes and amphibians) there is ... placental mammals are viviparous (embryos develop inside the mother's body, feeding from her).

In chordates the nervous system is dorsal and highly cephalized while in most invertebrates the nervous system is ganglial and ventral.

Description : In chordates the nervous system is dorsal and highly cephalized while in most invertebrates the nervous system is ganglial and ventral.

Last Answer : What is the group of the phylum Chordata that first colonized the terrestrial environment?

The tubular and dorsal nervous system of chordates is related to the cephalization in these animals and to bilateral symmetry. The presence of neural integrating centers with concentration of neurons in the brains and the spinal cord (central nervous system, CNS) allowed the increase of the interaction complexity between these animals and the environment. Receptor (afferent conduction) and efferent (motor, regulatory and behavioral reactions) functions come out more sophisticated in chordates due to the presence of more well-developed neural networks. These features have been preserved by evolution as they provide adaptive advantage to their owners.

Description : The tubular and dorsal nervous system of chordates is related to the cephalization in these animals and to bilateral symmetry. The presence of neural integrating centers with concentration of ... These features have been preserved by evolution as they provide adaptive advantage to their owners.

Last Answer : How can the tubular-dorsal nervous system in chordates be compared to the nervous pattern present in invertebrates?

Is the tubular-dorsal nervous system of chordates associated to radial or lateral symmetry?

Description : Is the tubular-dorsal nervous system of chordates associated to radial or lateral symmetry?

Last Answer : How does that explain the complexity level of the nervous system reached by the vertebrate evolutionary branch?