Which Animal Can Survive Being Frozen and Thawed?

Question

Which animal can survive being frozen and thawed during winter?

A. Polar bear
B. Wood frog
C. Penguin
D. Rabbit

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Correct Answer

Answer: B. Wood frog

The wood frog is an animal that can survive being partly frozen during winter. Much of the water in its body can freeze, and its heart may temporarily stop beating. When the weather becomes warmer, the frog thaws and becomes active again.

Let's Understand

Winter can be very cold in some parts of the world. Many animals protect themselves from the cold by moving to warmer places, finding shelter, or becoming less active. 

The wood frog has a remarkable way of surviving freezing temperatures.

During winter, the wood frog may become frozen while resting beneath leaves or other natural cover. Much of the water in its body freezes, and its breathing and heartbeat can stop temporarily.

How does it survive?

The frog's body produces large amounts of glucose, a type of sugar. This sugar helps protect its cells from damage caused by freezing.

When the temperature rises, the ice inside its body melts. Its heart begins beating again, and the frog gradually becomes active.

This special ability helps the wood frog survive winters that would be dangerous for many other animals.

A Simple Example

Imagine placing a small amount of water in a freezer. The water turns into ice when it gets cold enough. When you take the ice out and it becomes warm, it melts back into water.

The wood frog's survival is much more complicated than this simple example. Unlike an ice cube, the frog has living cells that need protection from freezing damage. Special substances in its body help protect those cells until warmer weather returns.

What About the Other Answers?

Option	Answer	Explanation
A. Polar bear	Incorrect	Polar bears survive cold weather with adaptations such as thick fur and body fat. They do not survive winter by freezing their bodies.
B. Wood frog	Correct	Wood frogs can survive having much of their body water freeze during winter and become active again after thawing.
C. Penguin	Incorrect	Penguins survive cold conditions using adaptations such as feathers and body fat. They do not freeze their bodies to survive winter.
D. Rabbit	Incorrect	Rabbits survive cold weather with fur, shelter, and other adaptations. They cannot safely freeze most of their body water like a wood frog can.

Did You Know?

1. Wood frogs live in cold regions.

Wood frogs are found in parts of North America, including areas where winters can be extremely cold.

2. A frog's heart can stop temporarily.

During freezing, a wood frog's heartbeat and breathing can stop. They resume as the frog thaws.

3. Glucose helps protect the frog.

Glucose is a type of sugar. In wood frogs, it helps protect cells against damage caused by freezing.

4. Tardigrades are tiny survivors.

Tardigrades are tiny animals (8 legged micro animals), sometimes called water bears. Some species can survive extreme freezing by entering a dormant state in which their activity becomes extremely low. They are different from wood frogs and use different survival strategies.

Think About It

If a wood frog can survive being partly frozen during winter, what special adaptations might other animals use to survive extremely cold weather?

Quick Recap

What We Learned	Simple Explanation
Wood frogs	These frogs can survive being partly frozen during winter.
Glucose	This sugar helps protect the frog's cells from freezing damage.
Thawing	When temperatures rise, the ice melts and the frog becomes active again.
Tardigrades	Some tiny animals can survive extreme freezing by entering a dormant state.