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Ch. 23 sec. 1-3

7th Grade Science

producer organism, such as a green plant or alga, that uses an outside source of energy like the Sun to create energy-rich food molecules.
consumer organism that cannot create energy-rich molecules but obtains its food by eating other organisms.
herbivores an animal that eats only plants
carnivores animal that eats only other animals or the remains of other animals; mammals having large, sharp canine teeth and strong jaw muscles for eating flesh .
omnivores an animal that eats both plants and animals
decomposers an organism, usually a bacterium or fungus, that breaks down the cells of dead plants and animals into simpler substances.
food chain a series of events in wich one organism eats another
food web model that shows the complex feeding relationships among organisms in a community.
energy pyramid a digram that shows the amount of energy that leaves from one feed level to another in the food web
water cycle the continuos process by wich water moves from earth's surface to the atmosphere and back.
evaporation the process by wich molecules of a liquid absorb energy and change into a gas state
condensation process in which water vapor changes to a liquid.
precipitation Rain, snow, sleet, or hail
nitrogen fixation the process of changing free nitrogen into a usable form
nodules bumps on the roots of certain plants that house nitrogen fixing bacteria
biogeography the study of the geographical distribution of living things.
dispersal the movement of organisms from one place to another
native species species that have naturally evolved in an area
exotic species species that carried in to a new location by people
climate average weather conditions of an area over time, including wind, temperature, and rainfall or other types of precipitation such as snow or sleet.
continental drift Wegener’s hypothesis that all continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positions.
Created by: RFul