AP BIOLOGY

Detailed explanation-1: -Birds and mammals, however, have a fully septated ventricle–a bona fide four-chambered heart. This configuration ensures the separation of low-pressure circulation to the lungs, and high-pressure pumping into the rest of the body.

Detailed explanation-2: -In the four-chambered heart, the left half is completely separated from right half by septa. This prevents oxygenated and deoxygenated blood from mixing. This allows a highly efficient supply of oxygenated blood to all parts of the body. This is useful in animals that have high energy needs, such as birds and mammals.

Detailed explanation-3: -Reason: Bats and whales have a four-chambered heart.

Detailed explanation-4: -As mammals, we have four main parts to the heart, a left and a right atrium and a left and a right ventricle. This is called a four-chambered heart. Other mammals and birds all have four-chambered hearts.

Detailed explanation-5: -They have a four-chambered heart. Example-pigeons, sparrows, etc.