population - a group made up of the same type of individuals, community - different populations of organisms that live in an ecosystem, producer - a living thing, such as a plant, than can make its own food, consumer - a living thing that can’t make its own food and must eat other living things, decomposer - a living thing that feeds on the wastes and remains of plants and animals, ecosystem - all of the living and nonliving things that interact with one another, extinct - no longer existing, energy - the ability to do work or to make something move or change in some way, scarce - not enough of something, over-abundant - too much of something, living - organisms that are alive and need food, water, air to survive, non-living - things that do not grow or move on their own; do not need food, water, or air, food chain - a path showing the transfer of energy from one organism to another, food web - connected sets of multiple food chains, sun (as energy source) - the original source of energy in food chains/webs, prey - an animal that is hunted and eaten by another animal., environment - everything around a living thing, including living and nonliving things, that helps it survive., energy Flow - the way energy moves from the Sun to plants and then to animals in a food chain or food web., predator - an animal that hunts and eats other animals,

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