Exam 33: Animal Diversity and the Evolution of Body Plans

A researcher is using molecular phylogenetic techniques to determine the evolutionary relationships of a large set of animal species.Which type of species are most likely to have been wrongly classified based on morphology alone?

Protostomes develop through

Pseudocoelomate nematodes lack a body cavity.

Select the following phylum that includes protostome animals that are segmented, bilaterally symmetric, and have a chitinous exoskeleton.

Damage to its flagellum would prevent a choanocyte from

Given the distribution of the 30 or so animal phyla across the Earth's various ecosystems, what would be the most likely habitat for the origin of animals?

What are the three animal phyla that dominate animal life on land?

Select the following phylum that includes animals that are unsegmented, acoelomate, and have a digestive cavity with a single opening.

Which one of the following applies to the phylum Ctenophora?

Which one of the following terms applies to the phylum Arthropoda?

Linnaeus lumped all of the worm-like animals into the category Vermes (Vermis is Latin for worm).Is this a valid classification scheme?

Eumetazoa can be subdivided into two principal branches based on ____.

Molecular data confirm that cnidarians branched off from the rest of animals before ____________ evolved.