Before eyes, life was gentler and tamer ... This appears to be a trivial matter. Many single-celled organisms have eyespots made of light-sensitive pigments. Some can even swim towards or away ...

It had black eyes and small black patches of fur ... “Choanoflagellates don’t have stem cells, they’re single-celled organisms, but they have these genes, likely to control basic cellular ...

The radiating, kaleidoscopic pattern you see here was once the living glass skeleton – the cell wall – of a single-celled organism called a diatom. These organisms absorb silicon from their ...

A single-celled stentor, however, is visible to the human eye at about one-to-two millimeters long ... “It’s amazing that a single-celled organism, with no brain or neurons, developed behaviors for ...