Which of the following soil particles is
important for providing space for air, water,
and root movement?
a. sand
b. silt
c. clay
d. both sand and silt
e. bond silt and clay
D
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The descriptive term ectotherm, when applied to reptiles, refers to the fact that:
a. they are warm-blooded b. they derive their body heat from outside of their body by certain behaviors c. their central body core works best when its temperature is the same as the ambient temperature d. their optimum temperature for muscle contraction occurs only when the sun provides direct solar heat e. they maintain their temperature by adjusting the production of metabolic heat
Non-smokers live about ____ years longer than smokers
a. two b. four c. six d. eight e. ten
Land animals can be affected by noise pollution by
a. damaging their sense of direction. b. causing changes in urination patterns. c. causing them to be more susceptible to predators. d. causing them to run into glass store fronts. e. none of these.
DNA polymerase
a. is an enzyme. b. adds new sugars to a strand. c. proofreads RNA strands to see that they are correct. d. unwinds the DNA molecule during repair. e. is made of uracil.