Simple organisms like sponges and cnideria circulate_____from their surrounding through their body cavities.

Simple organisms like sponges and cnideria circulate_____from their surrounding through their body cavities.
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Simple organisms like sponges and cnideria circulate_____from their surrounding through their body cavities. ... Blood C. Colourless plasma D. Water
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In which episode the animals are known as sponges ?

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Which is not correct for sponges?

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