We do not know in what order the three groups broke with each other. At this time they were probably all still single-celled organisms. 900 million ...
At first, all living things on Earth were simple, single-celled organisms. Much later, the first multicellular organisms evolved, and after that, Earth's ...
The earliest known fossils of most of the modern orders of mammals appear in a ...
In this way, the organic remains of living things are fossilized (changed into stone ), creating the evidence of ancient life studied by scientists. Because of the order ...
Detailed timeline[edit]. See also: List of bilateral animal orders. In this timeline, Ma (for megaannum) means "million years ago," ...
These are the Hadean (4.6 billion to 4 billion years ago), the Archean (4 billion to 2.5 billion years ago), the Proterozoic (2.5 billion to 541 million years ago), and ...
proposed and, after much debate, widely accepted that eukaryotes emerged as a result of a sequence of endosymbiosis between prokaryotes.
A few studies carried out on free-living animals under field conditions and simulated periodic and aperiodic conditions of the laboratory suggest that circadian ...
When living organisms reproduce, they pass on to their progeny a collection of traits.
Today life diversity on earth is the result of evolution.