When an atom or molecule gains electrons it is said to be ; when it loses electrons it is . Oxidation-reduction reactions always occur in reactions, because an atom or molecule cannot become unless there is a molecule to which it can donate its electrons. The atom or molecule that donates electrons is known as a agent and the one that accepts electrons is the agent.

Reduced; Oxidized; Cellular; Stable; Reducing agent; Oxidizing Agent

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

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for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.