An organism that obtains organic food molecules without eating other organisms or substances derived from other organisms. Autotrophs use energy from the sun or from oxidation of inorganic substances to make organic molecules from inorganic ones.

An organism that absorbs nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organisms and converts them to inorganic forms; a detritivore.

A consumer that derives its energy and nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organisms; a decomposer.

All the organisms in a given area as well as the abiotic factors with which they interact; one or more communities and the physical environment around them.

A measure of molecular disorder, or randomness.

An organism that obtains organic food molecules by eating other organisms or substances derived from them.

law of conservation of mass

A physical law stating that matter can change form but cannot be created or destroyed. In a closed system, the mass of the system is constant.

An herbivore; an organism that eats plants or other autotrophs.

An autotroph, usually a photosynthetic organism. Collectively, autotrophs make up the trophic level of an ecosystem that ultimately supports all other levels.

A carnivore that eats herbivores.

A carnivore that eats other carnivores.

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APB Unit 12 Lesson 4

AP B Unit 12 Lesson 4 Key Terms

Question	Answer
autotroph	An organism that obtains organic food molecules without eating other organisms or substances derived from other organisms. Autotrophs use energy from the sun or from oxidation of inorganic substances to make organic molecules from inorganic ones.
decomposers	An organism that absorbs nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organisms and converts them to inorganic forms; a detritivore.
detritivores	A consumer that derives its energy and nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organisms; a decomposer.
detritus	Dead organic matter.
ecosystem	All the organisms in a given area as well as the abiotic factors with which they interact; one or more communities and the physical environment around them.
entropy	A measure of molecular disorder, or randomness.
heterotroph	An organism that obtains organic food molecules by eating other organisms or substances derived from them.
law of conservation of mass	A physical law stating that matter can change form but cannot be created or destroyed. In a closed system, the mass of the system is constant.
primary consumer	An herbivore; an organism that eats plants or other autotrophs.
primary producer	An autotroph, usually a photosynthetic organism. Collectively, autotrophs make up the trophic level of an ecosystem that ultimately supports all other levels.
secondary consumer	A carnivore that eats herbivores.
tertiary consumer	A carnivore that eats other carnivores.

Created by: Jason Stanwood

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