With __________, a chemical substance is passed
from organisms at each trophic level to those above
and becomes increasingly concentrated in body
tissues. Fill in the blank(s) with the appropriate word(s).
Answer: biological magnification
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One mechanism that some animals use to limit heat loss in cold environments is
A. vasoconstriction of veins. B. vasoconstriction of the precapillary sphincters in the skin. C. increasing cardiac output. D. vasodilation of below surface blood vessels. E. vasodilation of the near surface blood vessels.
Muscle cramps are helped by massage and stretching, which increase blood flow to the affected area.
a. true b. false
Choose the one most appropriate answer for each.
A. Barr body B. Histone C. Repressor protein D. Promoter E. Master genes F. Homeotic genes G. Dosage compensation H. Enhancers
Destruction of which biome would result in the greatest loss of biodiversity?
A. grassland B. tropical rain forest C. desert D. taiga forest E. savanna