a characteristic that helps an organism survive in its habitat
special behaviors that help organisms adapt to changes in their environment
describes the great variety of life-forms on earth or within a habitat
a meat-eating animal
a symbiotic relationship in which one organism benefits while the other is not affected
all the different populations that live within a habitat
an organism that obtains nutrients by eating other organisms
a state in which an organism is inactive while it awaits more favorable conditions in its environment
the natural process by which one community of living things is replaced by another community in an orderly, predictable sequence, until a stable climax community appears
the living members of a community, plus the nonliving elements of their environment
a species that is in danger of extinction
species that no longer exist
a sequence of organisms through which nutrients are passed along in an ecosystem
a number of interconnected food chains
the remains or traces of an ancient organism
the particular environment in which an organism lives
a plant-eating animal
a sleeplike state of reduced body activity that some animals enter to survive the winter
moving from one environment to another where conditions are more favorable
a symbiotic relationship in which both organisms benefit
a consumer that can eat both plants and other animals
a symbiotic relationship in which one organism benefits while the other is harmed
a physical characteristic that enables an organism to survive under a given set of conditions
all the members of a particular species that live within a habitat
an organism that makes its own food; most producers are green plants
the reaction of a living thing to a change in its environment
a change in the environment that causes an organism to react in some way
a relationship in which two or more different organisms live in close association with one another; that is, when one organism lives on or inside another one
Living things and the nonliving things in their surroundings make up an ecosystem. Adaptations allow an organism to survive in a particular ecosystem.
Green plants use sunlight to make their own food. They are called producers. Animals depend on other organisms for food. They are called consumers. All organisms get their energy directly or indirectly from the sun.
Decomposers are organisms that break down the remains of dead plants and animals. Decomposers return nutrients to the environment.
Producers, consumers and decomposers may be linked in a food chain. Disturbing any part of a food chain affects other organisms the food chain.
There is a constant exchange of materials between an organism and its environment; these materials include food, water, oxygen and wastes.
Ecological succession is the natural process by which one community is replaced by another community in an orderly, predictable way.