Exam 24: Animal Diversity I: Invertebrates

One trend in the evolution of animals is the increase in the number of tissue (germ) layers during embryonic development. Flatworms and more complex animals have_________ layers.

The common ancestor of sponges and other animals was probably

Spiders belong to the

Animals that have no body cavity between the digestive system and the body wall are_________in terms of body plan.

The only invertebrates capable of flight are arachnids.

Of all of the invertebrate phyla, only members of the phylum_________ can fly.

How does the circulatory system of an annelid differ from the circulatory system of a gastropod?

The _________is the embryonic germ layer that develops into nervous tissue.

If motility is considered a characteristic of animals, then why are stationary creatures such as sponges still considered to be animals?

Flatworms lack

A_________ is an organism whose body cavity forms between the body wall and the digestive system.

A crayfish is a member of the phylum

Between the organs and the body wall, complex animals have a body cavity called a

Giant squids are classified as

A(n)_________ provides support and protection to arthropods.

Groups of similar cells that function together form_________ .

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

The tube feet of echinoderms that are used for locomotion, capturing prey, and gas exchange are ?inflated? by the_________ , which is unique to the echinoderms.

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?