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The time before any written history.
Post-historic
Ice age
Pre-historic
A community of interacting organisms and their environment.
Ecosystem
Biologists
Biodiversity
Any ground that remains completely frozen—32°F (0°C) or colder—for at least two years straight.
Permafrost
Greenhouse gases
Fosil Fuels
The process of bringing an extinct species back to life.
De-extinction
Endangerment
Extinction
A species of plant or animal that is in danger of becoming extinct.
Extinct
Endangered
Biodiversity
It is the genetic information inside the cells of the body that helps make people who they are.
Chromosomes
DNA
Cells
Scientist who try to understand the natural world and the things that live in it.
Biologist
Ecologist
Meteorologist
Variety of species living in an area.
Opponent
Biodiversity
Ecosystem
Gases in Earth's atmosphere that trap heat.
Greenhouse Gases
Permafrost
Ecosystem
One who fights, plays, or takes a position against another.
Biodiversity
Component
Opponents
