Ecology: The study of the interrelationships between living organisms and their environment.

Ecologist: A scientist who studies the interrelationships of living things to one another and their environment.

Ecosystem: A group of living organisms that, along with their abiotic environment (e.g. air, water, rocks), interact with each other over a period of time. Energy from the sun is used to feed this web of life.

Endangered: Describes a species threatened with immediate extinction throughout all or most of its range owing to the actions of people. See Extinct.

Energy: The capacity to do work or the ability to make things move.

Environment: All of the natural and living things surrounding us (including air, water, vegetation, climate, wildlife, humans…) that have an influence on us and our physical and biological existence.

Entomologist: a scientist who studies insects.

Erosion: The removal or wearing away of soil or rock by water, wind and other forceful processes.

Equator: An imaginary line around the Earth that is half-way between the North and South Poles.

Extinct: A plant or animal that no longer exists anywhere on Earth.

Evergreen: A plant that does not lose all of its leaves at one time. Most North American evergreens are coniferous.

Exemption: Special permission to be free from requirements that others must meet.

Export: To send goods or services to another country for sale or trade.

Extinction: The condition of having been removed from existence. An animal or plant facing extinction is one in danger of vanishing from our world.

Extirpated: Something that is no longer found in a wild area where it used to live (and where it belongs), but is found somewhere else.