Answer: (a) Oxygen
Explanation: Oxygen reacts with the plants food releasing energy.
Answer:
I think its mesosphere
Explanation:
Answer; Mechanically gated
1. New technology is developed that provides more information about the theory.
2. New experimental methods are designed to test a theory.
3. A single experiment produces results that differ from all previous experiments.
im not sure about #3 but it could be it