A range of conditions (for example: tow hours to five hours; very wet to only most; 50 degrees F to 80 degrees F) under which an organism can survive. Change
A colorless, odorless gas present in the atmosphere. It is exhaled by animals and used by plants to create oxygen. It changes the acidity of water when exhale by aquatic organisms.
A set of investigation that are almost exactly the same, except one variable is manipulated/change while all other variables are controlled or kept the same.