How can you determine the relative age of strata in a bed of rock?
a. darker colored la...
Biology, 06.01.2020 02:31, sabrinarasull1pe6s61
How can you determine the relative age of strata in a bed of rock?
a. darker colored layers are older.
b. younger layers cover older layers.
c. layers that have fossils are generally older.
d. each layer represents about one million years.
Answers: 2
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Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.
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