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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