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13 terms

Level of Organization of Living Things In the World

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Biosphere
the part of the Earth, including air, land, surface rocks, and water, within which life occurs, and which biotic processes in turn alter or transform
Ecosystems
a natural unit consisting of all plants, animals and micro-organisms in an area functioning together with all of the non-living physical factors of the environment
Communities
a group of interacting organisms sharing an environment
Populations
the collection of inter-breeding organisms of a particular species
Organisms
an individual living system (such as animal, plant, fungus, or micro-organism)
Organ systems
A group of related organs
Organs
a group of tissues that perform a specific function or group of functions
Tissues
a cellular organizational level intermediate between cells and a complete organism
Cells
the structural and functional unit of all known living organisms
Cell structures and viruses
An organelle, or the layout of organelles of the biological cell itself
Living and nonliving organic molecules
a sufficiently stable electrically neutral group of at least two atoms in a definite arrangement held together by very strong chemical bonds
Atoms
the smallest unit of an element that retains the chemical properties of that element
Subatomic particles
an elementary or composite particle smaller than an atom