Answer:
"Surface water and groundwater are both important sources for community water supply needs. Groundwater is a common source for single homes and small towns, and rivers and lakes are the usual sources for large cities."
Explanation:
They are both part of the water cycle. So your answer is C.
Hope this helps!!
Low to high concentration
The answer is A. Organisms compete for limited resources. A is wrong because it has nothing to do with reproduction which is natural selection.
