Maybe your mean four chambers?
four.
4 2 ventricles and 2 atriums.
! in 4, as the four suits have an equal number of cards.
Dogs are mammals and so have four-chambered hearts.
right atrium,left atrium.right ventricle and left ventricle
All humans have four chambers in their heart.
All mammals have a four chambered heart.
The Four-Chambered Heart was created in 1950.
Yes. All mammals have a four-chambered heart.
Mammals, birds, and crocodilians have a four-chambered heart.
four structures that compose the conduction of the heart
Nonliving things obviously don't have a heart, and a majority of organisms do not have a heart. For the animals that do have a heart, they will either have a two-, three-, or four-chambered heart.