species

habitat

Biodiversity

Random sampling

Species richness

Simpson's diversity index

Biological classfication

Taxonomy

Phylogeny

Prokaryotes

Protocists

Fungi

Plants

Animals

Binomial system

Dichotomus key

Variation

Genetic variation

Continuous variation

Discontinous variation

Adaptation

Xerophytic

Natural selection

Speciation

Extinction

Conservation

Conservaion

Environmental impact assessment