To maintain homeostasis, the respiratory system depends on the nervous system for signals to
a. exchange gases with the circulatory system.
b. enhance the amount of available oxygen in the lungs.
c. release enzymes to increase the exchange of gases.
d. coordinate the muscles that control breathing.

4.06 hc)a five-year review of threats to the southern resident orca population of the united states concluded that the top threats were prey availability, contaminants, and effects from recreational and whale watching vessels. further down the list are oil spills, disease, and effects from commercial vessels not targeting whales. how might this list be different if it were for transient whale populations, which have a larger average population size and live farther offshore in open waters? a)the transient population is more likely to be affected by contaminants. b)the transient population is less likely to be affected by whale watching vessels. c)the transient population is more likely to be affected by disease. d)the transient population is less likely to be affected by prey availability.

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

How are fossils most commonly formed