There are 4 chambers to the heart.
A shark heart has two chambers.
There are 4 chambers in a bird's heart.
A sheep heart has four chambers.
A reindeer, being a mammal, has four heart chambers.
There's 4 heart chambers in a human, which is a mammle
The human heart has four chambers. The atria are the upper chambers, and the ventricles are the lower chambers.
four chambers
A snails heart has 2 chambers.
They have two chambers.
Sharks have 2 chambers
4 chambers as they are mammals.