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What are the levels of structural organization?
substances needed to maintain life
What does the chemical level include?
atoms and molecules
smallest units of matter
(ex: carbon, oxygen)
two or more atoms joined together
basic structure and functional living units of an organism
"organs" of a cell designed to do specific tasks
group of similar cells that perform specialized functions
What are the four basic types of tissue?
structures that are composed of 2 or more different tissues with specific functions
consists of related organs with a common function
all systems working together to form one living person