Where is all the water that once flowed on mars? select all that apply. a. underground b. in polar ice caps c. evaporated into space d. water never flowed on mars.

Atown is built on the banks of a small lake on the edge of a desert. after some time, the townspeople discover that water from the lake has become too polluted to use. describe one way that the lake may have been contaminated by the actions of the townspeople, and explain how the townspeople can remediate this problem.

Fertility and mortality rates are higher in more developed nations.

What way does renewable energy differ from nonrenewable energy?