Question

why do sea turtles slow their heart rate?
to keep from having to eat often
to avoid predators
so they can stay warm
to preserve their oxygen underwater
rewatch

Explanation:

Sea turtles slow their heart - rate to conserve oxygen while underwater as they are air - breathing animals and need to stay submerged for long periods. Slowing the heart rate reduces the body's oxygen consumption.

Answer:

To preserve their oxygen underwater