Natural selection causes gradual changes in

A. A population

B. An environment

C. Acquired traits

D. An individual

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.