way a species interacts with

the abiotic and biotic factors to

obtain food, find shelter, and fulfill

other needs

act of one organism, the

predator, feeding on another

organism, its prey

a close, long-term

relationship between two species

that usually involves an exchange

of food or energy

series of chemical

reactions that convert the energy in

food molecules into a usable source

of energy called ATP

organism that cannot

make its own food

from Greek kyklos, means

“circle or wheel”

organism that consumes

the bodies of dead organisms and

wastes produced by living

organisms

model that shows

the amount of energy available in

each link of a food chain

model of energy transfer

that can show how the food chains

in a community are interconnected

organism that uses an

outside energy source, such as the

Sun, and produces its own food

natural

resource that is used up faster than

it can be replaced by natural

processes

can be

replenished by natural processes at

least as quickly as it is used

to carry out effectively

exhaustion of

one or more resources in an area

Living part of an ecosystem

Interactions among populations in a community. The community’s physical surroundings or abiotic factors

Role or position and species has in its environment