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Grade 5 B-2 Sci. Def

Chapter 2 Living Things Interact

TermDefinition
individual A single organism in an environment
population All the individuals of the same kind living in the same environment
community All the populations of organisms living together in an environment
ecosystem A community and its physical environment together
habitat A place in an ecosystem where a population lives
niche The role each population has in its habitat
producer Organisms that make their own food
consumer An organism in a community that must eat to get the energy it needs
food chain The ways in which the organisms in an ecosystem interact with one another according to what they eat
decomposer Consumers that break down the tissues of dead organisms
food web Shows the interactions among many different food chains in a single ecosystem
energy pyramid Shows the amount of energy available to pass from one level of a food chain to the next
competition The contest among organisms for the limited resources of an ecosystem
symbiosis A long-term relationship between different kinds of organisms
instinct A behavior that an organism inherits
learned behavior A behavior an animal learns from its parents
exotic An imported or nonnative organism
extinct No longer in existence; the result when the last individual of a population dies and that organism is gone forever
endangered A population of organisms that is likely to become extinct if steps are not taken to save it
threatened Describes a population of organisms that are likely to become endangered if they are not protected
Created by: scscolts
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