This is one of those bands that become single-cell organisms in concert, always moving forward to feed on the next chord.

A colony of single-cell organisms is known as a colonial organism.

It is one of the largest single-cell organisms.

The paramecium is a single-cell organism, so has nothing remotely resembling a brain.

The earliest evidence for life, single-cell organisms resembling bacteria, is 3.6 billion years old.

This type of reproduction is common among some single-cell organisms, for example, amoeba.

Serotonin is used by a variety of single-cell organisms for various purposes.

It is the simplest single-cell organism that operates in a manner similar to a human cell.

In bacteria and other single-cell organisms, the transduction processes a cell has limits the number of ways it can respond to its environment.

Without these single-cell organisms we would not, for example, have an atmosphere that supports human life or digest food efficiently.