Satellite imaging allows scientists to observe . a.
where deforestation has removed the trees
b.
where deforestation has occurred but is recovering
c.
where deforestation has not occurred
d.
all of the above

the answer is D. all of the above

Explanation:

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genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).