nonliving thing in an ecosystem

layer of gases surrounding Earth

living thing in the ecosystem

average weather conditions in an area over time

living and nonliving things in a given area

unicellular organisms without a membrane-bound nucleus

process during which water vapor changes into a liquid

cannot be separated by chemical means

process during which liquid water changes into water vapor

process that changes atmospheric nitrogen into compounds usable by living things

water that falls from the clouds to the Earth's surface

to set free

process using chemical energy in matter to make food

model showing how energy flows in an ecosystem

model of energy transfer showing how the food chains in a community are interconnected

model showing the amount of energy available in each step of a food chain

series of chemical reactions that convert light energy, water, and carbon dioxide into the food-energy molecule glucose and give off oxygen

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