Abiotic factors are the_
parts of an ecosystem.

Which of the following best describes homeostasis? a. keeping the internal environment in a stable state b. keeping the external environment in a stable state c. beneficial characteristics resulting from mutation d. reproduction that results in offspring identical to the parent.

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?