| A | B |
|---|
| producer | organism that makes its own food |
| autotroph | producers are called this |
| consumer | organism that eats other organisms for energy |
| herbivore | organism that eats only plants |
| carnivore | organism that eats other consumers |
| omnivore | organism that eats both consumers and producers |
| decomposer | organism that breaks down dead things and returns nutrients to the soil |
| photosynthesis | process by which energy from the sun is used to make sugar molecules |
| cellular respiration | process within organisms that use glucose and oxygen to produce energy |
| legumes | nitrogen fixing bacteria live within the nodules of root of plants called this |
| secondary succession | regrowth from a forest fire would be this type of succession |
| primary succession | on new islands formed by volcanoes you would find this succession |
| pioneer species | the first organisms to colonize a new area |
| lichens | example of a pioneer species |
| fertilizers | excessive use of this can affect the nitrogen and phosphorous cycles |
| climax community | during succession this is the final, stable community |
| ecological succession | gradual process of change and replacement of species |
| food web | complex transfer of energy between many organisms |
| fossil fuels | underground carbon sources composed of dead plants and animals that died a million years ago |
| carbon reservoir | the ocean and limestone |
