So the question gives me this info General mammalian life cycle

Gametes >> Process 1 >> Zygote >> Process 2 >> Embryo >> Process 3 >> Reproductive organs >> Process 4 >> Gametes. Process 1 seems to be fertilization, process 2 seems to be mitosis, but what about process 3? Process 4 is meiosis so I'm only stuck on what process 3 would be.

The question = Identify what is occurring at Process 1, Process 2, Process 3, and Process 4.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

i think that it is plants