Peramorphosis
Different animals undergo different changes as they grow it depends on the species. Some grow, some molt, and some change completely.
Metamorphosis
undergo mitosis.
The sapling will undergo many changes before it becomes a mature tree.
In.
T lymphocytes undergo their final maturation in the thymus, hence why they are called 'T cells'.
Each cell would be half the size of a mature cell that's ready to undergo mitosis. After all, mitosis is a process that literally splits a mature cell in two.
The mature animal would be called the "parent" to the baby animal, which would be called the "child".
Osteoblasts mature into osteocytes.
Ewe = female mature sheep.
Adolescent; Mature
Compare her apparent disinterest in men and sex in act 1 ("I'll look to love if looking liking move.") with her very mature and adult sexual desire in act 3 ("Gallop apace you fiery footed steeds")