6. CO2 is a reactant in what process? * a. Photosynthesis
O b. Aerobic Respiration
O c. Anaerobic Respiration
O d. All of the above

photosynthesis.

CO2 is a product of respiration.

cells spend most of their time in interphase

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.