Which of the following must exist in a population before natural selection can act upon that population?
A) genetic variation among individuals
B) variation among individuals caused by environmental factors
C) sexual reproduction
D) All of the above are correct.
Correct Answer:
Verified
Q3: What are adaptations?
A)inherited characteristics of organisms that
Q4: During a study session about evolution, one
Q7: Which of the following is the most
Q8: Lamarck's contribution to evolutionary theory was the
A)use
Q12: What was the prevailing belief prior to
Q13: Artificial selection is
A)human-directed selective breeding.
B)past extinction.
C)patterns of
Q15: Fossils are found in
A)sedimentary rocks.
B)igneous rocks.
C)metamorphic rocks.
D)glass.
Q22: Darwin's observation of the Galápagos Islands finches'
Q25: DDT was once considered a "silver bullet"
Q34: Analogous features share _ function but not
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