Description : One example of animals having a single opening to the outside that serves both as mouth as well as anus is (a) Octopus (b) Asterias (c) Ascidia (d) Fasciola.
Last Answer : (d) Fasciola.
Description : Example of cyclostomata a) Petromyzon b) Ascidia c) Amphioxus d) Narcine
Last Answer : a) Petromyzon