How do polar bears maintain homeostasis in freezing cold weather? (1 point)
Responses
Their metabolism slows down to preserve heat.
Their metabolism slows down to preserve heat.
They hibernate in warm areas in order to heat their bodies.
They hibernate in warm areas in order to heat their bodies.
Their thick fur retains heat.
Their thick fur retains heat.
Their metabolism speeds up to produce heat.
Their thick layer of blubber insulates their bodies and retains heat.
Which example shows an organism that cannot reach homeostasis through internal changes? (1 point)
Responses
A dog shivers when it is too cold.
A dog shivers when it is too cold.
Circulation decreases in a bird when it becomes too warm.
Circulation decreases in a bird when it becomes too warm.
A person gets a fever in response to a flu infection.
A person gets a fever in response to a flu infection.
A lizard is cold, and it moves to a sunny rock to warm up.
A lizard is cold, and it moves to a sunny rock to warm up.
How is homeostasis achieved?(1 point)
Responses
Cells maintain internal stability.
Cells maintain internal stability.
Cells secrete stomach enzymes.
Cells secrete stomach enzymes.
Cells control involuntary movements.
Cells control involuntary movements.
Cells control voluntary movements.
Cells maintain internal stability.
Their metabolism speeds up to produce heat.
The correct answer is: Their metabolism speeds up to produce heat.
In freezing cold weather, polar bears are able to maintain homeostasis by increasing their metabolism to produce heat. This is known as thermogenesis, a process in which the body generates heat to maintain a stable internal temperature. It allows polar bears to survive in extremely cold temperatures.
To arrive at this answer, we can apply some basic knowledge about how animals adapt to cold weather. When it's cold, animals can use several mechanisms to regulate their body temperature. Some animals, like reptiles, might seek out warm areas to heat their bodies, but this is not the case for polar bears.
Polar bears have a thick layer of blubber and a dense fur coat, which acts as an insulating barrier and helps to retain heat. While this is an important adaptation, it is not enough to protect them in freezing temperatures alone.
Polar bears have a specific thermoregulation system that involves increasing their metabolism. This means their body processes, such as digestion and energy production, become more efficient and produce more heat. By increasing their metabolic rate, they can generate enough heat to keep their body temperature at an optimal level, despite the freezing cold environment.
Therefore, the correct answer is that polar bears maintain homeostasis in freezing cold weather by speeding up their metabolism to produce heat.