Question

3.1.9-12.g during a period of intense activity, such as when an animal runs away from a predator, oxygen levels in the body decline. as oxygen becomes limited, cells in the body switch from performing aerobic respiration to performing anaerobic respiration. what is a consequence of this switch?

the animal can begin consuming carbon dioxide rather than producing it.

the animal receives less energy from each glucose molecule it breaks down.

the animal can begin producing oxygen rather than consuming it.

Explanation:

To solve this, we analyze each option:

1. For the first option: Aerobic and anaerobic respiration in animals produce \(CO_2\); animals don't consume \(CO_2\) (plants do via photosynthesis). So this is incorrect.
2. For the second option: Aerobic respiration of one glucose yields ~36 - 38 ATP, while anaerobic (like lactic acid fermentation in animals) yields only 2 ATP. So less energy per glucose is correct.
3. For the third option: Animals are heterotrophs and don't produce oxygen (plants do via photosynthesis). So this is incorrect.

Answer:

The animal receives less energy from each glucose molecule it breaks down.