Abdomen: the last of the three parts of an insect’s body. There you can find their heart, digestive system, and reproductive organs.

Acid: A water-soluble chemical compound that tastes sour or bitter, irritates skin and eyes, and reddens litmus paper.

Acidic: You would use the word acidic when you are talking about an acid. For example: "The vinegar was very acidic." The word acidic is also used to describe something that has acid in it.

Acid Rain: A harmful type of precipitation that occurs when airborne chemicals like sulfur dioxide and nitrogen dioxide dissolve in rainwater.

Adaptation: A special feature or behaviour developed by organisms to help them survive in a particular environment.

Agriculture: The process of preparing the land to grow food, producing crops, and raising animals.

Alpine: Relating to high mountains.

Amphibian: An animal that typically lives partially in an aquatic habitat (breathing by gills) as young and primarily in a terrestrial habitat (breathing by lungs and through moist skin) as an adult, e.g. frogs.

Arctic Tundra: Found in northern Canada, this habitat is an area characterized by cold temperatures, few, if any, short stunted trees and soil that is frozen for most of the year.

Atmosphere: A thin layer of gases above and around the Earth. It is between outer space and the Earth.