This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web.
a. bacteria and fungi, the decomposers, recycle carbon from dead organisms.
b. carbon is found in the grass and is passed from one level to the next in this food web.
c. all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere.
d. plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.