Question

most of cellular respiration takes place inside the ____, as long as there is ____ present. options: chloroplast; oxygen (orange), mitochondria; carbon dioxide (blue), chloroplast; carbon dioxide (green), mitochondria; oxygen (red)

Explanation:

To solve this, we recall cellular respiration concepts:

1. Cellular respiration (aerobic, which requires oxygen) primarily occurs in the mitochondria. Chloroplasts are for photosynthesis, so options with chloroplast are incorrect.
2. Aerobic respiration needs oxygen. Carbon dioxide is a product, not a reactant for most of cellular respiration. So the correct pair is mitochondria (site) and oxygen (required substance).

Answer:

D. mitochondria; oxygen (assuming the red option is D, with text "mitochondria; oxygen")