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Science exam 3

Teacher: Chapter 5
Across
Features of the environment that are alive or were once alive
Air surrounding Earth; is made up of 78% nitrogen, 21% oxygen and .03% carbon dioxide
Model describing how nitrogen moves from the atmosphere to the soil, to living organisms and then back to the atmosphere
Natural, gradual changes in the types of species that live in an area; can be primary or secondary
Organism that cannot create energy-rich molecules but obtains it food by eating other organisms
Part of earth that supports life; including the to portion of earth's crust, the atmosphere, and all the water on earth's surface
Down
Any close relationship between species, including mutualism, commensalism, and parasitism
Model describing how carbon molecules move between the living and nonliving world
All the organisms that belong to the same species living in a community
Model describing how water moves from earth's surface to the atmosphere and back to the surface again through evaporation, condensation, and precipitation
Cold, dry, treeless biome with < 25 cm of precipitation each year, a short growing season, permafrost and winters that can be 6 - 9 months long
Place where an organism lives and that produces the types of food, shelter, moisture and temperatures needed for survival