The processes of photosynthesis and cellular respiration both involve exchanges of two gases-oxygen and carbon dioxide—with the atmosphere. How does the exchange of gases compare between the two processes?
A. Both processes remove carbon dioxide and oxygen from the atmosphere.
O
B. Both processes add carbon dioxide and oxygen to the atmosphere.
C. Both processes add carbon dioxide to the atmosphere and remove oxygen from the atmosphere.
D. The gas that
added to the atmosphere by one process is removed from the atmosphere by the other process.

what bodys are there orbiting?

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.