Answer:
C. controlling their heart rates to slow down to use lessoxygen and go longer without food
Step-by-step explanation:
An example of a physiological adaptation in emperor penguins is controlling their heart rates to slow down to use less oxygen and go longer without food.
Emperor penguins are adapted to live in the extreme cold of the Antarctic. They have several physiological adaptations that allow them to survive in this environment. One of these adaptations is their ability to control their heart rates. When they are swimming or diving, emperor penguins can slow down their heart rates to conserve oxygen and go longer without food. This allows them to conserve energy and survive in the cold water.
Other physiological adaptations in emperor penguins include their thick layers of blubber, which help to insulate their bodies and keep them warm, and their specialized feathers, which help to reduce heat loss from their bodies. These adaptations allow emperor penguins to thrive in the harsh conditions of the Antarctic.