Fact 1: All life relies on a relatively narrow range of pH, or acidity. Fact 2: Plant life has increased. Given the two facts above, what relies on a narrow pH range?

Pick your answer from:
1). trees.
2). potatoes.
3). a fish.
4). cacti.
5). pine.
6). plants.
7). Oak.
8). bacteria.
Answer:
6).