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.
why do cell-mediated immunity decrease at puberty
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.
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.
After the onset of puberty, males produce semen.
Humans ARE mammals
Nothing , that's what happens during puberty
Hormones !
They can produce risk's to humans because they soften the plastic with phthalates. They can damage Human DNA to much exposure will damage them. They are linked to early puberty.