Horizontal gene transfer is MOST common:

Name: Horizontal gene transfer is MOST common:
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Horizontal gene transfer is most common among bacteria. This can occur through transformation (uptake of free DNA from the environment), transduction (transfer of DNA by a virus), or conjugation (direct transfer of DNA between bacterial cells). While horizontal gene transfer can occur in other organisms, it is particularly prevalent in bacteria due to their ability to exchange genetic material with one another.

Horizontal Gene Transfer Is MOST Common