Which statement best describes why the carbon cycle is important to life? A.
Without carbon being returned to the atmosphere, plants eventually would not have the carbon dioxide they need.
B.
Without carbon being cycled, there would soon be no carbon left on Earth, so organisms would not be able to get nutrients.
C.
Without a way to create more carbon, plants and animals would soon have to survive only on nutrients that do not contain carbon.
D.
Without a way to remove carbon from the atmosphere, plants would be harmed by the accumulation of atmospheric carbon dioxide.

What do nitrifying bacteria convert

9. the history of life on earth is recorded in

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.