Today's vocabulary

5. cycle the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land
7. cycle substance turnover is a pathway by which a chemical substance moves through both the biotic (biosphere) and abiotic
8. nutrient is essential to understanding biological processes.
9. is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.
10. the process of turning from liquid into vapor.
12. cycle released into the atmosphere by photosynthetic organisms is taken up by aerobic organisms while the carbon dioxide released as a by-product of repiration is taken up for photosynthesis.

1. a substance that provides nourishment essential for growth and the maintenance of life.
2. cycle the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.
3. the loss or removal of nitrogen or nitrogen compounds; specifically :reduction of nitrates or nitrites commonly by bacteria
4. bloom, a rapid growth of microscopic algae or cyanobacteria in water, often resulting in a colored scum on the surface.
6. decompose through the action of bacteria and fungi.
11. productivity the rate at which energy is converted by photosynthetic and chemosynthetic autotrophs to organic substances