He proposed that over a large period of time natural selection could lead to change in order to better adapt a species to their changing environment
Answer:
It suggests that only some organisms need energy to live.
The 2 molecules that carry energized electrons to the second stage of the cellular respiration process, would be D. NADH and FADH2. These are carrying corresponding electrons via or with hydrogen atoms attached to the molecules.
To gain info by observering something or someone
The patient has been brought in for observation