Fair Test - an experiment where only one variable is changed, and everything else stays the same, Nutrient - a substance that living things need to grow and stay healthy, System - a group of things that affect each other and function as a whole, Algae - tiny living things in water that produce their own food, like plants do, Bacteria - an organism that is usually a decomposer; some cause illness, Carbon Cyle - the process of carbon moving through living things and the environment, Phytoplankton - tiny, floating living things in water that are smaller than algae and produce their own food, like plants do, Disadvantage - something that is bad or reduces the chances of success, Fertilizer - a material that contains nutrients to help plants grow, Runoff - water that moves across a surface, often carrying materials with it, Atmosphere - the air that surrounds a planet, Energy - the movement of energy through living things, Food Chain - how living things are connected through what they eat and what they are eaten by, Food Web - many different food chains found in one place,

5th Grade Mystery Science Unit 1: Lessons 4-7

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