| A | B |
|---|
| Carbon cycle | The process by which carbon is cycled between the atmosphere, land, water, and organisms. |
| Nitrogen-fixing bacteria | These make nitrogen usable for organisms by converting gaseous nitrogen to ammonia (a form we can use). |
| denitrification bacteria | These are in soil and water and convert nitrogen back to the gaseous form. |
| Nitrogen Cycle | The process in which nitrogen is cycled between the atmosphere, soil, and organisms. |
| Phosphorus Cycle | The movement of phosphorus from the environment to organisms and then back to the environment. |
| Nitrogen | This is necessary to make proteins. |
| Phosphorus | 85% of this is found in our bones and teeth |
| Fossil Fuels | The burning of these contribute to the increase of carbon dioxide |
| Too much of these can lead to plant overgrowth and strangle all other life forms in the water. | nitrogen and phosphorus |
| Plants use _________ in the process of photosynthesis to make sugar and oxygen. | carbon dioxide |
| This reaction stores energy. | photosynthesis |
| This reaction releases energy. | cellular respiration |
| Uses CO2 and O2 and energy to produce C6H12O6 (glucose) and O2 | photosynthesis |
| Uses C6H1206 (glucose) and O2 to produce energy, carbon dioxide and water | cellular respiration |
| Fertilizers | runoff of these into water can cause algae blooms |
| In the past, huge deposits of carbon were stored as dead plants and ___________ animals. | decayed |
