How do oxygen levels in water affect the survival of aquatic animals?

Oxygen levels in water are crucial for the survival of aquatic animals, as they rely on dissolved oxygen for respiration. Low oxygen levels can lead to hypoxia, which can cause stress, reduced growth, and even death in fish and other aquatic organisms.

This answer is strong because it clearly explains the relationship between oxygen levels and the survival of aquatic animals, addressing both the physiological need for oxygen and the consequences of low levels. The question tests the understanding of how abiotic factors influence living organisms.