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Abiotic Factor

nonliving part of an organism's environment

Biosphere

portion of Earth that supports life

Biotic factor

all the living organisms that inhabit an environment

Commensalism

symbiotic relationship in which one species benefits and the other species if neither harmed nor benefited

Community

collection of interacting populations

Ecology

scientific study of interactions among organisms and their environment

Ecosystem

made up of the interactions among the populations in a community and a community's physical surroundings

Habitat

place where an organism lives out its life

Mutualism

symbiotic relationship in which both species benefit

Niche

role and position a species has in its environment

Parasitism

symbiotic relationship in which one organism derives benefit at the expense of the other

Population

group of organsisms of one species that interbreed and live in the same place at the same time

Symbiosis

relationship in which there is a close and permanent association among organsisms of different species

Autotroph

organism that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients

Decomposer

organism that breaks down and absorbs nutrients from dead organisms

Food Chain

simple model of how scientists use to show how matter and energy move through an ecosystem

Food Web

expresses all the possible feeding relationships at each trophic level in a community

Heterotroph

organism that cannot make their own food and must feed on other organisms

Scavenger

animal that feed on other animals that have already died

Trophic Level

organism in a food chain that represents a feeding step in the passage of energy and materials through an ecosystem

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