Substance movement identifies aerobic respiration

Steps:

• Examine diagram for substances entering and leaving the cell, such as oxygen and glucose in, carbon dioxide and water out.
• Recall aerobic respiration equation: C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP.
• Compare diagram flows to equation inputs/outputs in mitochondria.
• Rule out processes with mismatched substance movements.

Why A is correct:

• Aerobic respiration requires oxygen influx and produces CO2 efflux, matching the diagram's flows per the balanced equation C6H12O6 + 6O2 → 6CO2 + 6H2O + energy.

Why the others are wrong:

• B: Anaerobic respiration occurs without oxygen and yields lactate or ethanol, not CO2 and water.
• C: Assimilation incorporates absorbed nutrients into cell structures, without specific gas exchanges shown.
• D: Photosynthesis absorbs CO2 and releases O2, opposite to the diagram's movements.

Final answer: A