What Is the Main Basis for Placing the Arthropods and Nematodes

question 36

Multiple Choice

What is the main basis for placing the arthropods and nematodes in the Ecdysozoa in one hypothesis of animal phylogeny?

• A)Animals in both groups are segmented.
• B)Animals in both groups undergo ecdysis.
• C)They both have radial, determinate cleavage, and their embryonic development is similar.
• D)The fossil record has revealed a common ancestor to these two phyla.
• E)Analysis of genes shows that their sequences are quite similar, and these sequences differ from those of the lophotrochozoans and deuterostomes.

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