The death by bubonic plague of about one-third of Europe's population during the 14th century is a good example of
A) abiotic factors limiting population size.
B) a density-dependent effect.
C) a density-independent effect.
D) uniform population dispersion.
Answer: B
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Answer the question using the accompanying figure. Label B illustrates Plasmodium infection of the ____
a. kidney b. liver c. gall bladder d. stomach e. lung
Action potentials
a. can move up or down an axon, away from or towards the cell body. b. move in a one way direction towards the cell body . c. move in a one way direction away from the cell body. d. can jump from cell to cell. e. do none of these.
Which description applies to typical quantitative traits?
A) Such traits are easy to follow using Punnett squares. B) Such traits are not affected by the environment. C) Such traits are usually influenced by only one gene. D) Such traits show continuous variation.
A microscope that exposes specimens to ultraviolet, violet, or blue light and forms an image with the light emitted at a different wavelength is called a ________ microscope.
A. fluorescence B. scanning electron C. dark-field D. phase-contrast