The correct answer is "amphibians".

Here's why:

1. Crocodiles: They are reptiles and have a four-chambered heart, with two atria and two ventricles.

2. Mammals: All mammals, including humans, have a four-chambered heart, with two atria and two ventricles.

3. Amphibians: Most amphibians have a three-chambered heart, with two atria and one ventricle. This is the exception in the list.

4. Birds: Birds, like mammals and crocodiles, have a four-chambered heart, with two atria and two ventricles.

Question

The correct answer is "amphibians".

Here's why:

1. Crocodiles: They are reptiles and have a four-chambered heart, with two atria and two ventricles.

2. Mammals: All mammals, including humans, have a four-chambered heart, with two atria and two ventricles.

3. Amphibians: Most amphibians have a three-chambered heart, with two atria and one ventricle. This is the exception in the list.

4. Birds: Birds, like mammals and crocodiles, have a four-chambered heart, with two atria and two ventricles.

Knowee AI · Accepted Answer

The correct answer is "amphibians".

Here's why:

1. Crocodiles: They are reptiles and have a four-chambered heart, with two atria and two ventricles.

2. Mammals: All mammals, including humans, have a four-chambered heart, with two atria and two ventricles.

3. Amphibians: Most amphibians have a three-chambered heart, with two atria and one ventricle. This is the exception in the list.

4. Birds: Birds, like mammals and crocodiles, have a four-chambered heart, with two atria and two ventricles.

Four-chambered hearts, two atria and two ventricles, are found in all of these animals exceptMultiple choice question.crocodiles.mammals.amphibians.birds.