In animals that display indeterminant development:

Collar cells are a characteristic of:

Spiders and certain other arthropods which lack jaws or mandibles are placed in a subphylum called

Which of the following best describes the nervous system of Hydra?

The germ layer that gives rise to the animal digestive tube and digestive organs is called:

Which of the following statements about hydra is false?

African sleeping sickness is spread by flea bites.

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

All ________ have two very different types of nuclei within their cells, small micronuclei and larger macronuclei.

Protist locomotion is accomplished by the contraction of muscle fibers.