a group of cells that work together to perform a specific job in the body
when two or more tissues work together to perform a specific job
organs work together in groups to perform particluar jobs
anything that can live on its own
a single cell that lives on its own
organisms that can only exist only as a group of cells
a group of organisms that are the same kind and that live in the same area
two or more different populations living in the same area make up a community
the community and all of non-living things that affect it
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