especially in the transition from simple single cell organisms to complex organisms like animals and plants. "We already know that increases in marine phosphorus and seawater oxygen concentrations ...

But single-celled organisms have stuck together or assembled to spawn multicellular descendants more than two dozen times, suggesting that maybe it’s not such a big leap after all. 1 “These genes that ...

Observing this pattern was huge for scientists as it proved that certain single-celled organisms are capable of complex decision-making processes. It also challenges the commonly-held assertion ...

It couldn’t have lived like any organism alive today ... are the earliest evidence on Earth of large, biologically complex beings. There are now more than 50 different Ediacaran forms known ...

About 800 million years ago, oxygen levels reached about 21 percent and began to breathe life into more complex organisms. The oxygen-rich ozone layer was also established, shielding the Earth's ...