The aorta is the vessel that delivers oxygenated blood to systemic capillaries for gas exchange.
The pulmonary trunk carries unoxygenated blood so it is out of the question. The circumflex artery is a branch of the left coronary artery which supply blood to the heart. This leaves us with the AORTA.
Is renewable and also releases lots of carbon dioxide.
Given that ATP is the product of the reaction, it must be cellular respiration (also, since it occurs in both plants and animals it can't be photosynthesis).
A and B must be glucose and oxygen. It makes sense if you think about it. We breathe in oxygen, and we eat food. Food contains glucose (sugar). We need to consume these things in order to make energy. Carbon dioxide is D because it's the "left over" of this reaction. That's why we exhale it. And C is enzymes because they catalyze (promote) just about every reaction in the body.
Another way to remember this in the future is just to memorize the equation (attached). Just remember that its the exact opposite of photosynthesis.
Carbon, Hydrogen, and Oxygen show up in all 4
I don't seem anything but they go through a cell cycle called mitosis. The cells during interphase produce double of everything and then during PMAT, the cells split.