Exam 19: Evolution of the Animal Phyla

Chordates can be characterized as having:

Animals in which the anus develops before the mouth in the embryo are:

How is the liver fluke transmitted to humans?

Which of the following is missing in parasitic flatworms compared to the free-living flatworms?

All of the following are correct about protostomes except:

Which feature is not a characteristic of the animals?

Describe a hypothesis for the origin of metazoans from single celled protists.

What group has a water vascular system,moves with tube feet,and has an endoskeleton?

Which feature of mollusks is a rasping tongue-like organ?

Chordates are characterized by having a ________________,a dorsal,flexible supportive rod.

Of the mollusks,octopuses are in the class of:

Sand dollars,sea stars,sea cucumbers,and sea urchins all belong to the phylum _____.

The function of the notochord is taken over by the ____________ in vertebrates.

Of the mollusks,snails are in the class of:

The subkingdom of animals that lack symmetry and have no true tissues or organs is the:

_________________ are small,aquatic pseudocoelomate organisms that have a crown of cilia on their heads.

It has often been said that the next dominant animals on land,after a hypothetical demise of all mammals,would be the insects.Why so?

The key evolutionary development seen for the first time in the sponges is that of:

The ability of a sponge cell to identify other such sponge cells is called ______________________.

Which of the following represents the more of the arthropods than any other group?