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the diversity of plant and animal life in a particular habitat (or in the world as a whole)

extinct species

a species that was once present on Earth but has died out

endangered species

a species whose numbers are so small that the species is at risk of extinction

threatened species

a species that could become endangered in the near future

introduced species

species moved by humans to new geographic areas, either intentionally or accidentally

native species

Species that are originally found in a certain area.

acid rain

rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water

ozone depletion

Decrease in concentration of ozone (O3) in the stratosphere. See ozone layer.

conservation biology

the study and implementation of methods to protect biodiversity

habitat restoration

the process of taking action to bring a damaged habitat back to a health condition

captive population

population of organisms cared for by humans

reintroduction program

programs that release organisms into an area where their species once lived in hopes of reestablishing naturally reproducing populations

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