Species - a group of organisms capable of interbreeding and producing fertile offspring.

I now turn to bacteria, the simplest organisms capable of a non-parasitic life.

The Symbiots are a parasitic organism capable of taking over practically any organic matter.

The costs are mostly from biological factors, and there is a need for highly productive organisms capable of conversion of sunlight to biomass.

Cryozoa are organisms capable of surviving temperatures below 0 C for extended periods.

This union established a motile organism capable of living in the already existing acidic and sulfurous waters.

A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring.

But it wipes out the only organisms capable of building the dynamic wave-resistant framework on which all other reef species depend.

It is a quasi-conscious self-modifying organism capable of infecting any form of life.

The Materpiscis fossil is believed to be the earliest organism capable of internal fertilisation.