Which of the following statements concerning horizontal gene transfer is most correct?
a. Horizontal gene transfer only occurs in bacteria.
b. Horizontal gene transfer occurs through sexual reproduction.
c. Horizontal gene transfer has had a major effect on the evolution of life on Earth.
d. Horizontal gene transfer has been extremely rare in all lineages.
e. Horizontal gene transfer is a hypothetical phenomenon for which there is no actual evidence.
Answer: c. Horizontal gene transfer has had a major effect on the evolution of life on Earth.
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