Natural selection is least likely to be the cause of a change in a population's allele frequencies when: a. there is no competition for resources. b. the population has no genetic variation. c. there is ample genetic variation in the population. d. the ecosystem experiences extreme disturbances.

The nurse is caring for rescued flood victims in the emergency department. which drugs are used to treat cerebral edema or decrease free water in clients with submersion injuries? select all that apply.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.