Why do eyes have pupils?

By |2019-09-15T21:02:50-07:00May 27th, 2017|Biology|0 Comments

Cats have pupils that can get bigger or smaller. Eyes start to focus light By around 550 million years ago, some kinds of worms evolved eyespots sunk into their heads to protect them from being damaged. The origin of eyespots From eyespots to eyes Still the Proterozoic All our biology articles As a side effect, [...]