The Precambrian is the name given for ... The Ediacaran Period , the last of the Proterozoic Era, saw the first multicellular organisms. Autotrophs and soft-bodied heterotrophs filled the ...

The earliest living organisms were microscopic bacteria ... is not unlike one of the first life forms that appeared in the Precambrian era. Photograph by Joel Sartore, National Geographic Photo ...

In the ensuing period, the Cambrian, all of these organisms are gone, and most of the groups we're familiar with—along with a few unfamiliar ones—are present. The transition between the two is ...

This tiny fossil, measuring just a few centimeters, is significant as it is the oldest confirmed ecdysozoan and the only one ...

The strange creatures that lived in the Garden of the Ediacaran more than 540 million years ago, before animals came on the scene, may have been much more dynamic than experts have thought.

During the Proterozoic era, oxygen produced by photosynthesizing ... While oxygen-loving organisms evolve in these changing conditions, oxygen-intolerant anaerobes survive only in airless pockets.

published in the journal Precambrian Research. Abderrazzak El Albani Life on Earth looks good for its age. Newly discovered fossil records hint that mold-like unicellular organisms — the common ...

Groove-like tracks on the ocean floor made by giant deep-sea single-celled organisms could lead to ... grooves and furrows found from the Precambrian era, as early as 1.8 billion years ago ...

Scientists have found It extremely difficult to fit these Precambrian species into the tree of life. That is because they lived in a time before organisms developed the ability to make shells or ...