Would the desert ecosystem (#2 above) or the forest ecosystem (#3 above) be better able to support a
fourth trophic level made up of tertiary consumers ?
explain your answer
ecosystems
mcdonald publishing co.

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

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.

What percentage of light hits earth's surface directly?