the diversity of plant and animal life in a particular habitat (or in the world as a whole)
a species that was once present on Earth but has died out
a species whose numbers are so small that the species is at risk of extinction
a species that could become endangered in the near future
species moved by humans to new geographic areas, either intentionally or accidentally
Species that are originally found in a certain area.
rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water
Decrease in concentration of ozone (O3) in the stratosphere. See ozone layer.
the study and implementation of methods to protect biodiversity
the process of taking action to bring a damaged habitat back to a health condition
population of organisms cared for by humans
programs that release organisms into an area where their species once lived in hopes of reestablishing naturally reproducing populations