The two main processes by which plant cells absorb, release, and use energy are a) fermentation and respiration. b) digestion and photosynthesis. c) photosynthesis and respiration. d) aerobic and anaerobic respiration.

The correct answer is C) photosynthesis and respiration. It powers almost all trophic chains and food webs on the Earth is called Photosynthesis. The process which organisms oxidize organic molecules and derive energy known as ATP from the molecular bonds that are broken is called respiration.

If the experiment was perfomed more then once and you get the same results