You are presented with the question "What are the cells of living beings called?" and the following answer choices: 
- organs
 - Microscopic organisms
 - sub-units of species
 - microscopic building blocks
 - epidermis and dermis
 - cell walls
 - organisms
 - female sex cells

Now knowing that cells are the microscopic building blocks of organisms and any living being is an organism, choose the best answer.


 

    microscopic building blocks     