The first invertebrates to develop a true nervous system are
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The first invertebrates to develop a true nervous system are
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The most primitive invertebrate to possess musculo- epithelial cells and nerve cells is
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Sea anemone is
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Ascaris is characterized by
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Which group does not contain polyp?
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The canal system in sponges develops due to
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Phylum Porifera is classified based on
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Flame cells are the excretory structures for
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Which of the following combinations is incorrect?
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Salamander belongs to the class
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Identify the characteristic of acoelomates
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Which class has the largest number of animals?
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