Exam 24: Animal Diversity I: Invertebrates

How does the skeletal system of an arachnid differ from that of a cephalopod?

The are the simplest animals to have an excretory system. (Hint: This system consists of cilia beating within canals.)

The common ancestor of sponges and other animals was probably

Which cnidarian is the basis of many impressively diverse marine habitats?

What distinguishes a free- living flatworm from other organisms?

Your job is to classify a newly discovered animal species. Your initial studies reveal that your specimen lacks tissues and organs and has no head, body symmetry, body cavity, or segmentation. To what phylum does this animal belong?

Which of the following phyla contains animals that reproduce asexually?

The organism shown here is a(n)

Which of the following animals are arachnids?

Adult echinoderms that have radial symmetry lack

Members of the phylum are characterized by having tube feet.

The animals most like the ancestral protist colonies that likely gave rise to all animals are

A hemocoel is part of an open circulatory system.

The low energy demands of nematodes allow them to survive without a

Chordates and echinoderms are both protostomes.

The only invertebrates capable of flight are arachnids.

A crayfish is a member of the phylum

A jointed exoskeleton is a characteristic of _.

Which of the following characteristics is associated with all animals that are bilaterally symmetrical at some point in their life cycle?

Which of the following animals uses a radula to scrape food into its mouth?