1. the line that divides the earth into two equal parts, the northern hemisphere and southern hemisphere, and over the course of a year receives the most amount of heat from the sun causing seasonal changes in weather to be less dramatic and almost non-exist
2. the struggle between the organisms of an ecosystem to obtain the resources needed for survival
3. a biome characterized by extremely dry conditions, usually sandy with little to no vegetation
4. the coldest biome on earth, characterized by no trees, a layer of permafrost under the top layer of soil, and low precipitation
5. the term used to refer to moisture that falls to the earth's surface in the form of rain, snow, or sleet
6. a biome characterized by dense tree growth with a thick, multilayered canopy, high amounts of precipitation, and an average temperature of 77 degrees Fahrenheit that doesn't vary more than about 5 degrees all year
7. one of the most biologically diverse biomes, characterized by standing water such as marshes, bogs, and swamps; high precipitation; and usually humid conditions
8. the ability of an organism to change in response to its environmental surroundings in order to survive
9. the largest body of water on earth covering more than 70% of the surface with a salt content of 3% or greater
10. the most widespread land-based biome on earth that contains mostly grass like vegetation with few to no trees, experiences seasonal changes in weather, and receives average amounts of rainfall
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11. the natural, continuous cover provided by the branches and leaves of trees blocking out sunshine to ground level plants
12. a large environmental area characterized by similar vegetation, temperature, or other environmental characteristics
13. a long period of time with little to no rainfall
14. one of the sub-categories of the grassland biome characterized by a wet and dry season with moderate to significant tree growth but where the trees are too sparse to form a canopy
15. a term used to describe land or soil that is permanently frozen thus unable to support vegetation growth
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