Biology G9

2. a chemical that is essential to living things and is cycled through ecosystems
3. the total mass of living organisms in a defined group or area
6. The regions of Earth where living organisms exist
8. an ecosystem that is capable of withstanding pressure and giving support to a variety of organisms
9. measure of the amount of energy or biomass transferred from one trophic level to the next higher trophic level
10. the hard part of Earth’s surface
11. an ecosystem that is water- based, either fresh water or salt water
13. an ecosystem that is land-based
15. a process that changes solar energy into chemical energy
17. a process in which materials, especially toxins, are ingested by an organism at a rate greater than they are eliminated
18. the living parts of an ecosystem
19. A process that releases energy from organic molecules, especially carbohydrates, in the absence of oxygen
20. the non-living parts of an ecosystem
21. a process in which nutrient levels in aquatic ecosystems increase, leading to an increase in the populations of primary producers
22. The warming of Earth as a result of greenhouse gases, which trap some of the energy that would otherwise leave Earth

1. the layer of gases above Earth’s surface
4. all the interacting parts of a biological community and its environment
5. all the water found on Earth, including lakes, oceans, and ground water
7. A process that releases energy from organic molecules, especially carbohydrates, in the presence of oxygen
12. Atmospheric gases that prevent heat from leaving the atmosphere, thus increasing the temperature of the atmosphere
14. a category of organisms that is defined by how the organisms gain their energy
16. Rain,snow,or fog that is naturally acidic due to gases in the atmosphere that react with water to form acids