| A | B |
|---|
| energy pyramid | a diagram that compares the amount of energy available at each position, or level, in the feeding order |
| consumers | get their energy from producers |
| food chains | shows the path along which nutrients and energy flow in an ecosystem |
| food web | a combination of all the food chains in a community |
| respiration | organisms use sugar and oxygen to release energy, carbon dioxide and water |
| photosynthesis | energy from the sun, carbon dioxide and water produces sugar and oxygen |
| nitrogen | essential to life and is a part of all proteins |
| decomposers | break down dead plants and animals and in the process release forms of nitrogen |
| water cycle | shows how water moves through an ecosystem |
| evaporation, precipitation, condensation | three processes of the water cycle |
| plants | use nitrogen compounds to make proteins |
| arrows in a food web | show the pathways by which energy and nutrients flow |
