#1216 Cold-blooded Fish

Cold-blooded animals, such as fish, rely heavily on the surrounding water temperature to ___ their body heat. When the water temperature rises, the fish’s body temperature also rises, ___ to increased metabolic activity. This means they swim faster, breathe quicker, and require more oxygen and food. Conversely, when the water temperature falls, their metabolism slows down, making them more ___ and less active.