Ks3 Geography lesson Year 7, 8 or 9 Biodiversity - key terminology Biosphere - The ecosystem comprising the entire earth and the  living organisms that inhabit it Biodiversity - The variety of plant and animal life in the world or in a particular habitat flora - plants related to an area Fauna - animals related to an area biofuel - A fuel derived immediately from living matter tropical rainforest - a rainforest with a high rainfall that grows in a tropical region.  ENDANGERED - A SPECIES SERIOUSLY AT RISK OF EXTINCTION DEFORESTATION - the action of clearing a wide area of trees.