AP BIOLOGY

EVOLUTION

SOURCES OF VARIATION IN A POPULATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
During the winter months when resources such as food and water may be scarce, some animals
A
go into estivation
B
ignore their circadian rhythms
C
go into hybernation
D
use warning colorations
Explanation: 

Detailed explanation-1: -Hibernation is a hypothermic condition when animals save energy during cold seasons by lowering body temperature, metabolism, breathing, and heart rate. This makes it possible for an animal to survive the winter on a fat deposit that would otherwise not last the winter.

Detailed explanation-2: -Certain animals hibernate because food supplies become scarce during the winter months. By going into a long deep sleep, they bypass this period completely, waking up when food becomes more plentiful.

Detailed explanation-3: -Which animals hibernate? Small mammals, such as chipmunks, dormice, hamsters, hedgehogs and bats. Also, many insects, amphibians and reptiles.

Detailed explanation-4: -Some animals hibernate, or sleep, while other animals go to warmer areas in the winter. When an animal goes to a warmer place it is called migration. Finally, other animals adapt to survive the snow and cold temperatures. If animals migrate, they do so before winter.

Detailed explanation-5: -During hibernation, an animal’s body temperature, heart rate, breathing, and other metabolic activities slow down significantly in order to conserve energy. While resources are scarce, hibernation allows animals like bears, chipmunks, and bats to use their stored energy much more slowly.

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