When we think of respiration we usually think of inhaling oxygen and exhaling carbon dioxide. Assuming that all of the CO we exhale is waste from cellular respiration, how
does the carbon atom in CO2 enter the body?

If all prokaryotes on earth suddenly vanished, which of the following would be the mostlikely and most direct result? a) the number of organisms on earth would decrease by 10—20%.b) human populations would thrive in the absence of disease.c) bacteriophage numbers would dramatically increase.d) the recycling of nutrients would be greatly reduced, at least initially.e) there would be no more pathogens on earth.