Which one of the following is not an ecosystem service?
A. maintaining the quality of water supplies
B. habitat restoration
C. preventing soil erosion
D. absorbing pollutants
E. moderating climate
B. habitat restoration
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Which information is most useful?
What will be an ideal response?
Which of the following pairs indicates the closest
macroevolutionary link among the animals according to the evolutionary history tree in the text? a. turtles; crocodiles b. lizards; amphibians c. mammals; birds d. bony fishes; lung fish e. crocodiles; birds
Vasopressin is a hormone that is primarily released when the body is low on water. Release of vasopressin causes the kidneys to conserve water by concentrating urine and decreasing urine output. However, vasopressin also has additional functions in other tissues such as the brain and blood vessels, which are not directly involved in urine production. How could it be possible for vasopressin to trigger different responses in different tissues?
A. The kidneys have a receptor for vasopressin, but cells in the brain and blood vessels do not have a receptor for vasopressin. B. Vasopressin can be released at different times to result in different effects. C. Vasopressin can bind to, and act on, different receptor subtypes, leading to different cellular responses in different tissues. D. Vasopressin binds to the same exact receptor in different tissues, but causes a different conformational change to the receptor in each tissue.
The tracheal system of insects __________.
cb. is stiffened with chitinous rings and leads into the lungs c. is filled by positive pressure breathing d. ramifies along capillaries of the circulatory system for gas exchange e. provides an extensive, fluid-filled system of tubes for gas exchange