Explanation:

Amphibians are a group of animals that undergo metamorphosis, meaning they go through distinct stages of development. This group includes animals like frogs, toads, and salamanders. Reptiles, on the other hand, are a separate group of animals that includes turtles, snakes, and lizards.

Function of the Heart:

The function of the heart is to pump blood throughout the body, providing oxygen and nutrients to the cells. In most animals, including mammals, birds, and reptiles, the heart pumps oxygenated blood to different parts of the body. However, there are some exceptions.

Heart Function in Pisces:

Pisces refers to a group of animals known as fish. Fish have a two-chambered heart, meaning they have a single atrium and a single ventricle. This type of heart allows for the pumping of oxygenated blood to the gills, where oxygen is extracted from the water and carbon dioxide is released. Deoxygenated blood then returns to the heart and is pumped to the rest of the body.

Heart Function in Amphibians:

Amphibians, including frogs and toads, have a three-chambered heart. This type of heart consists of two atria and a single ventricle. The oxygenated blood from the lungs or skin (in the case of amphibians that breathe through their skin) is mixed with deoxygenated blood from the body in the ventricle. This mixed blood is then pumped to the lungs and skin for oxygenation before being circulated to the rest of the body.

Conclusion:

Based on the information provided, it can be concluded that in the group of animals mentioned in option B (Amphibians only), the heart does not pump oxygenated blood to different parts of the body. Instead, the blood is mixed before being pumped to the lungs or skin for oxygenation. This is in contrast to other groups of animals like fish (Pisces) and reptiles, where the heart pumps oxygenated blood to different parts of the body.

Ya B is correct