The answer would be pubic hair. Because, secondary sexual characteristics.
Visible secondary sex characteristics are nonreporductive sexual characteristics.
For males things that will start to show are pubic hair, facial hair, and Adam's apple.
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Under certain circumstances, bacteria can divide several times an hour. In ideal conditions, bacteria can divide around 100 times and produce millions of bacterial cells in a couple hours.
A half hour to an hour. It is called Duration.