Which phrase best describes scientific theories?

The hormone secreted from alpha cells of the pancreas in response to decreased blood glucose is

Evolution occurs at which level of biological organization? select one: a. species b. cells c. individuals d. populations

1. Why is dirt considered living?

Which term best describes the movement of water molecules in and out of a cell?

Which process is part of the hydrologic cycle?

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?