Why do we get goosebumps?

Answer: Tiny muscles pull hairs upright

Tiny muscles pull hairs upright ✓ — Correct! Goosebumps happen when tiny muscles at the base of each hair contract and pull the hair upright. This is an evolutionary leftover from our furry ancestors, where raising hairs would trap warm air in thick fur. But humans have little body hair, so it barely helps us stay warm. We still get this reflex when cold or experiencing strong emotions like fear or awe!

Blood vessels contract — Wrong. Blood vessel constriction is a separate response to cold. Goosebumps are caused by tiny muscles raising hairs, an evolutionary reflex from when we had thick fur.

Skin cells multiply — Wrong. Goosebumps don't involve skin cell multiplication. They're caused by tiny muscles at hair follicles contracting to raise hairs upward.