What is the main basis for placing the arthropods and
Chapter 0, Problem 6(choose chapter or problem)
What is the main basis for placing the arthropods and nematodes in 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. Fossils reveal a common ancestor of the 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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