To be scientifically valid, a hypothesis must be

Which of the following does a flatworm do to obtain its food

Differences in density of ocean water is important because it produces surface waves causes the Coriolis effect drives deep-ocean currents

What does the endocrine system regulate?

Long periods of species stability that is interrupted by periods of rapid change is what type of evolution?

How can a tsunami warning system save lives

What do cells need to do between divisions to make sure that a full set of dna gets passed on to each daughter cell?

True or false: The central nervous system allows us to sense the environment

Which of the following statements is false regarding root hairs? a. they are outgrowths of endodermal cells c. they increase the surface area of the root b. they are outgrowths of epidermal cells d. they absorb water and nutrients

Why is it critical to divide the chromosome number in half?

The amino acid proline is one of the three amino acids that watson describes as having "special properties". what is special about proline?