For girls, its EGG cells(which help create babies), and for guys, its SPERM cells(which help make the babies)
until the onset humans canto produce active reproduction cells
spawns (girls) hypomalogival raty (boys)
Humans always have a sense of smell. Puberty has nothing to do with it.
During puberty, the sex organs in humans develop due to hormonal changes. In males, the testes produce more testosterone, leading to the growth of the penis and testes. In females, the ovaries produce estrogen, causing the development of the uterus, vagina, and breasts. This process is essential for reproduction and sexual maturity.
A virus affects humans by invading a cell. The virus then forces the cell to produce viral material rather than cell material. This causes the cell to replicate the virus rather than itself.
a stem cell from an animal / humans [but still not proven possible] may be used to produce clones.
Humans ARE mammals
After the onset of puberty, males produce semen.
You can produce sperm in your semen once puberty has begun. Before puberty begins you will not be able to produce semen. The testes will produce the sperm when the secondary sexual characteristics are ready.
Reproduction, including the ability to produce gametes (sperm in males, eggs in females) and engage in sexual activity, is a process that can only be completed once puberty starts.
Nothing , that's what happens during puberty
Hormones !