Examlex
Apoptosis is a programmed cell death used by natural killer cells.
Biodiversity
The variety of life in all its forms and ecosystems, including genetic, species, and ecosystem diversity.
Public Lands
Areas owned and maintained by the government for the use and benefit of the general public.
Earth's Ecosystems
The complex networks of living organisms and their physical environment present on Earth, interacting as a system and including both natural and human-modified ecosystems.
Wilderness Areas
Natural environments on Earth that have not been significantly modified by human activity, designated for conservation and as habitats for numerous species.
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