The vaginal canal has a collapsed, folded structure (rugae) that expands when aroused or during childbirth. These folds increase elasticity and surface area.
An erection is a vascular process where the corpora cavernosa fill with blood, increasing in length and thickness, often initiated by the parasympathetic nervous system.
leaf: originates from the Proto-Germanic word *lauba (leaves), maybe from Proto-Indo-European *leub(h), meaning "to peel off/ to strip". Man, these puns just write themselves, don't they
Almost all frogs fertilize the eggs outside of the female's body. The male holds the female around the waist in a mating hug called amplexus. He fertilizes the eggs as the female lays them.
School uniforms originated in medieval England (1222)
The earliest recorded uniform was the “cappa clausa” robe ordered by the Archbishop of Canterbury.
