The internal temperature of mammals is maintained within a narrow range; to do so, mammals must have _____.
A) receptors sensitive to temperature
B) cells that absorb excess heat
C) circulating chemicals in the blood that tell cells when to absorb or release heat
D) molecules that are activated by changes in temperature
E) all of the choices
Answer: A) receptors sensitive to temperature
You might also like to view...
________ provide valuable flood control because they can hold large volumes of water
Fill in the blank(s) with correct word
The effect of DDT on birds is a result of which three characteristics of DDT?
a. metabolism, persistence, and biological magnification b. bioaccumulation, metabolism, and resistance c. biological magnification, resistance, and persistence d. persistence, bioaccumulation, and biological magnification e. metabolism, resistance, and biological magnification
DNA moves within an electric field because it
A) is negatively charged. B) is positively charged. C) makes up chromosomes, which are slightly electromagnetic. D) can possess different charges (positive or negative), depending on its base sequence.
What are ways that pioneer species differ from climax communities?
a. Pioneer species occur only in primary succession, while climax communities occur in both types of succession. b. Pioneer species inhabit volcanic islands, while climax communities occur on continents. c. Pioneer species include only one or two species, while climax communities include many species. d. Pioneer species reproduce in small numbers, while climax communities reproduce in large numbers. e. Pioneer species tend to be small and simple, while climax communities tend to be larger and more complex