A cactus plant, a snake, and a hawk can be members of the same A- community
B- kingdom
C- population
D- species

In a certain ecosystem owls are predators for mice. the owl population increases and they eat more mice this causes the mouse population to decrease what happens next? a.the birth of mice increases. b. the birth rate of owls increases c. the population of owls decreases d. the population of mice increases

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?