Earth’s surface is mostly water. However, only a small amount of water on Earth is clean freshwater. Why is it important to maintain water quality? A. to keep water from evaporating
B. to keep the ocean levels from lowering
C. to keep the polar ice caps from melting
D. to keep water from becoming a nonrenewable resource

Needed fast 15 points the process of natural selection favors certain characteristics in organisms, while it selects against other characteristics. what would happen if there was zero variation between all of the organisms on earth? a. organisms would evolve to increase variety b. natural selection would operate faster c. less food would be available d. evolution through natural selection would not occur

Acontinental polar air mass foms in

Which event had the greatest impact on culture of south america