Hierarchy for life on Earch

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Atom

Smallest particle of an element

organ system

group of organs that work together to perform a specific function

organ

A collection of tissues that carry out a specialized function of the body

molecule

A group of atoms bonded together. It is the smallest part of a chemical compound.

biome

A group of ecosystems with similar climates and organisms

population

A group of individuals that belong to the same species and live in the same area

tissue

A group of similar cells that perform the same function.

Organism

A living thing

Community

All the different populations that live together in an area

cell

Basic unit of life

Ecosystem

an area where plants, animals, and other organisms work together.

Biosphere

the part of Earth where life exists


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