What is a group of families called

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.

Which statement describes how favorable traits in a population relate to natural selection? they are the only traits that ever exist in the population. they build in the population over time. they are rarely passed on to offspring. they are found only in a few individuals within the population.