Although Earth’s ecosystems are remarkably diverse in their characteristics, they all run on energy captured by ____
a. autotrophs
b. heterotrophs
c. consumers
d. decomposers
e. detritivores
ANSWER: a
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Eutrophication
A. causes massive die-off of fish and invertebrates. B. is characterized by heavy surface algal blooms. C. occurs when there are excess nutrients in aquatic ecosystems. D. restricts the O2 supply to water below the surface. E. All of the choices are correct.
The bicuspid (mitral) valve is located between the
a. left and right atria. b. right atrium and right ventricle. c. left and right ventricles. d. left atrium and left ventricle. e. left ventricle and the aorta.
The alleles an individual inherits are the
a. phenotype b. allelotype. c. homotype. d. heterotype. e. genotype.
Reptiles, birds, and insects excrete nitrogenous wastes in the form of
A. uric acid. B. urine. C. urea. D. ammonia.