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Enviormental Science

Vocab. Chapter #3

carnivore consumers that eat only other consumers (flesh-eaters)
cellular respiration the process of breaking down food to yield energy
climax community the community that eventually forms if the land is left undisturbed
consumer gets energy by eating other organisms
decomposer consumers that get their food by breaking down dead organisms, causing them to rot.
food chain sequence in which energy is transferred from one organism to the next as each organism eats another.
food web an illustration of what organisms eat in an ecosystem
herbivore consumers that eat only producers (plant-eaters)
nitrogen-fixing bacteria the only organisms that can use nitrogen gas directly from the atmosphere are a few species of bacteria
omnivore eats both the producers and consumers (plants and animals)
pioneers the first organisms to colonize any newly available area and start the process of succession.
precipitation When the clouds meet cold air, the water returns to the earth again in the form of precipitation, rain, sleet or snow.
primary succession succession that occurs on surfaces where not ecosystem existed before
producer an organism that makes its own food
secondary succession occurs on a surface where an ecosystem has previously existed, such as in the burned aras around Mount St. Halens
succession is a regular pattern of changes over time in the types of species in a community.
trophic level each step in the transfer of energy through an ecosystem
water cycle water moves between the Earth's surface and the atmosphere in a process called the water cycle.
Created by: ethanheiges