Which of the following statements is true?
a. If the numbers of a population decrease, an endangered species may be reclassified as a
threatened species.
b. If the numbers of a population decrease, a threatened species may be reclassified as an
endangered species.
c. If the numbers of a population increase, a threatened species may be reclassified as an
endangered species.
d. The terms threatened species and endangered species mean the same thing.
B
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In an Arctic food web, the organisms in these pictures represent the ____
a. second trophic level b. secondary consumers c. first trophic level d. primary consumers e. third trophic level
Which of the following does not characterize a synovial joint
A) Joint cavity filled with fibrous tissue B) Fibrous material forms a joint capsule C) Lubrication with a fluid D) A synovial membrane?
Which is an example of potential rather than kinetic energy?
a. an apple made up of energy-rich macromolecules b. a firefly using light flashes to attract a mate c. a skier at the bottom of a hill d. a candle giving off light
Which antibodies form dimers that protect mucosal surfaces from invasion by pathogens?
A. IgM B. IgE C. IgA D. IgD