And it turns out, according to a recent study, that the prehistoric Earth may have been home to a fourth kind of organism which no longer exists. The study, a preprint posted to BioarXiv, focuses on ...

It was only then that they realized they were dealing with a previously unknown group of archaea. Like bacteria, archaea are single-celled organisms. Genetically, however, there are significant ...

Different allelic forms of a single gene can appear and disappear from time to time within a single group of organisms. This means that the gene pool of a population is dynamic and can change at ...

This biological reality, however, plays havoc with notions that evolutionary lineages cleave instantaneously, or that we can perfectly circumscribe groups of organisms into discrete taxonomic groups.

The organisms in the study are known as 'multicellular magnetotactic bacteria,' or MMB. Being magnetotactic means that MMB are part of a select group of bacteria that orient their movement based on ...

A species is a group of organisms that interbreed to produce fertile offspring. Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.

A species is a group of organisms that interbreed to produce fertile offspring. Selective breeding is when organisms are deliberately bred so their offspring have the desirable characteristics.