What relies on a relatively narrow range of something you can measure with paper strips?\nOptions:\n- (A) Length\n- (B) voltage\n- (C) all life\n- (D) mammals\n- (E) humans\n- (F) Most plants\n- (G) agriculture\n- (H) animals
Step-by-step reasoning process below:
(C)
All life relies on a relatively narrow range of pH, or acidity.

Acidity is measured with a pH meter or with pH paper strips.

All life relies on a relatively narrow range of something you can measure with paper strips.

.

Therefore, the answer is (C)