Which is not an example of matter and energy cycling through living things A. Grass growing B. A rock resting on the ground C. Cows eating grass D. Grass giving off oxygen?

B. A rock resting on the ground is not an example of matter and energy cycling through living things. Unlike grass, cows, and the process of photosynthesis that involves the exchange of gases, a rock does not participate in biological processes or energy transformations.