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Answer:

Across
1A chemical produced by the endocrine system that helps regulate conditions in the human body.
4A group of cells that work together to perform a similar function.
5Protects the body from foreign pathogens. Helps repair injuries or illnesses.
Down
2A group of tissue that works together to perform a similar function.
3The most basic building block of living things. Made up of organelles.
 
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