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What are eyespots? Evolution of eyes – Biology

By |2019-06-03T15:52:30-07:00May 28th, 2017|Biology|

Euglena have red eyespots (thanks to Sharon Mooney) When did cells learn to see? About two billion years ago, or maybe a little later, some eukaryote cells developed the ability to see. That was during the Proterozoic period, not long after the first cells evolved. Sight was one of the first things that [...]

Why do eyes have pupils? Evolution and Biology

By |2019-06-03T18:50:53-07:00May 27th, 2017|Biology|

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, [...]

How do eyes work? Evolution and Biology

By |2019-06-03T16:05:12-07:00May 27th, 2017|Biology|

A flatworm with eye-spots Eyespots came first Living creatures have been able to tell if it's light out or not  for about two billion years. That's when some eukaryote cells evolved to be able to sense changes in their surroundings and react to them. More about eyespots The Proterozoic Eukaryote flagella All our biology articles For [...]