Blood first enters the heart's right atrium. A muscle contraction forces the blood through the tricuspid valve into the right ventricle. When the right ventricle contracts, blood is forced through the pulmonary semilunar valve into the pulmonary artery. Then it travels to the lungs
The letter Is C
because dentists/doctors
have to move from a dirty place
to a clean place so thier patients wont get infected
Hope this helps mark brainlist
Any chromosome other than the sex chromosomes (X, Y).
They help bring about chemical reactions.
