Species

A group of organisms that differ from all other groups of organisms and that are capable of breeding and producing fertile offspring. This is the smallest unit of classification for plants and animals.

Source: OceanLink Glossary of Common Terms and Definitions in Marine Biology 

An interbreeding group of organisms that is reproductively isolated from all other organisms, although there are many partial exceptions to this rule in particular taxa. Operationally, the term species is a generally agreed fundamental taxonomic unit, based on morphological or genetic similarity, that once described and accepted is associated with a unique scientific name.

Source: Millennium Ecosystem Assessment  Glossary

Alien species - Endangered species

GreenFacts Summary on Biodiversity & Human Well-being:

• 1. Biodiversity: What is it, where is it, and why is it important?

Deutsch: Art (Biologie)
Español: Especie
Français: Espèce
Nederlands: Soort

Static Fields

Climate Change

Boron

Arctic Climate Change

Fluoride