(7) the carbon-oxygen cycle illustrates how
a) herbivores give off oxygen
b) producers give off oxygen
c) all organisms give off carbon dioxide
d) both b and c

(8) when animals excrete urea, which type of organism is responsible for converting this waste into a form that is usable by plants?
a) decomposers
b) lichens
c) climax community
d) saprophytes

Does the sun release radiant energy?

3points hurry! what is the relationship between biotechnology, sharkskin, and disease resistance? bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it. disease-causing microbes have been genetically modified to keep them from infecting the skins of sharks. scientists have created a device that can be attached to the skins of sharks that dramatically increases their abilities to resist disease. sharkskin produces many chemicals that can be collected and used to create antibiotics.

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.