Exam 24: Animal Diversity I: Invertebrates

Members of the phylum _________are characterized by having tube feet.

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

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

Animals obtain energy through photosynthesis.

A clam is a(n)

Most animal phyla are radially symmetrical.

During insect complete metamorphosis, a larva forms a _________before becoming an adult.

What causes schistosomiasis, a devastating disease that affects about 200 million people in tropical regions?

A jointed exoskeleton is a characteristic of_________ .

Adult echinoderms that have radial symmetry lack

An animal whose body cavity is completely lined with mesoderm has a pseudocoelom.

Anemones have no

A snail is a(n)

An arthropod exoskeleton is composed of

Which of these groups is characterized by a lack of symmetry (neither radial nor bilateral)?

The taxonomic group that contains the most species and seemingly most intelligent invertebrates is

Which of the following animal phyla is distinguished by a lack of tissues?

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

The Trichinella worm, which causes trichinosis, is classified as a(n)_________ .

A multicellular organism that lacks cell walls and obtains energy by eating other organisms is a(n)