Answer:
1. atoms and molecules
2. cells
3. tissues
4. organs
5. organ system
6. organism
Explanation:
1. atoms and molecules: these are the smallest units of matter and the building blocks of all biological structures.
2. cells: the basic structural and functional units of life. cells can be prokaryotic (lacking a nucleus) or eukaryotic (having a nucleus).
3. tissues: groups of similar cells working together to perform a specific function. Examples include muscle tissue, nervous tissue, and epithelial tissue.
4. organs: structures composed of two or more types of tissues that work together to perform a specific function. examples include the heart, brain, and lungs.
5. organ systems: groups of organs that work together to perform a coordinated set of functions. examples include the digestive system, respiratory system, and circulatory system.
6. organism: an individual living thing, consisting of one or more cells, organised into tissues, organs, and organ systems.
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