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Sciencer

1. The levels of organization in the human body, from simplest to most complex, are the  chemical level (atoms and molecules), cellular level (cells) , tissue level (groups of similar cells), organ level (structures made of different tissues), organ system level (groups of organs working together), and finally, the organism level (the complete human body). 

2. Chemical Level : This is the most basic level, involving atoms (the smallest units of matter) combining to form molecules. For example, carbon, hydrogen, and oxygen atoms combine to form glucose molecules. 

3. Cellular Level :  Molecules then combine to form cells, which are the basic structural and functional units of all living organisms. 

4. Tissue Level : Similar cells that work together for a specific function are grouped into tissues. There are four primary types of tissues in the human body: epithelial, connective, muscle, and nervous tissue. 

5. Organ Level: A distinct anatomical structure made of two or more different tissues working together to perform a specialized function is called an organ. Examples include the heart, lungs, brain, and skin.

6.   Organ System Level : Groups of organs that work together to perform a complex function make up an organ system. Examples include the digestive system and the cardiovascular system. 

7. Organism Level : The most complex level, consisting of all the organ systems working together to maintain life processes in the entire human body.

8. What do humans, frogs, cats, sharks have in common in terms of organs and organ systems?