biotic - having to do with life, or caused by living things, abiotic - non-living things in an ecosystem (sunlight, air, weather, water, soil, etc.), matter - anything that has mass and takes up space, energy - the ability to cause changes in matter, interact - When something changes something else, photosynthesis - the process of plants making their own food using energy from the sun, properties - characteristics of a substance that can be observed, vapor - a substance in a gaseous state, classify - to arrange or organize according to class or category, mass - the amount of matter in an object, weight - a measure of the pull of gravity on an object, volume - the amount of space an object takes up, gravity - The force that pulls all objects to the Earth’s surface,

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