The basic unit of life, a membrane covered structure that has all the materials necessary for life.

A group of similar cells working together to perform a job.

A group of tissues working together to do a job in an organism.

A group of organs working together to do a job in an organism.

All of the organ systems working together create a multicellular ________.

All of the same species at the same place at the same time.

All of the populations in an area.

The community plus the non-living environment.

A unicellular organism without a nucleus.

Any cell that the DNA is contained inside a nucleus.

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