The continental crust is than the oceanic crust and seems to "float" on the mantle.
a) thinner
b) younger
c) less dense
d) mostly basalt
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it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

the correct answer is:

a population changes in response to a change in the environment.