The persistence of malaria and sickle-cell anemia within a population best illustrates _____
a. bottlenecking
b. balanced polymorphism only
c. natural selection only
d. artificial selection only
e. balanced polymorphism and natural selection
e
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The Amazon rainforest’s declining ability to withdraw CO2 from the atmosphere has not been attributed to increased
____.
a. logging b. farming c. tree mortality rates d. logging bans e. fires
The primary reason that Earth experiences seasons is because of the:a
Earth's rotation. b. Earth's orbit. c. Earth's tilt on its axis. d. unequal thickness of the Earth's atmosphere. e. different layers of the Earth's atmosphere.
Which of the following statements about the function of flowers is TRUE?
A) They provide nutrients to the embryo. B) They protect seeds until they are mature. C) They attract seed dispersers. D) They aid in the dispersal of seeds. E) They attract pollinators.
The microscope preferred for viewing living specimens is the ________ microscope
A) bright-field B) phase-contrast C) scanning electron D) scanning tunneling E) transmission electron