Out of the options I would have to say Penetrating Keratoplasty, I am not sure
People like to do more stuff on a screen than they dont think that science is everywhere but they are to busy on their phones to notice.
Answer:
D. pituitary gland
~+. lil more info .+~
The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.
Electrons get “excited” or charged by sunlight, then they move on through the photosystem 2 and 1 along the etc or electron transport chain
Aero is the prefix for oxygen or air
Aerobic= needs air
Anaerobic=no air needed