You are presented with the question "What varies in shape but are all microscopic?" and the following answer choices: 
- alveoli
 - small
 - ovaries
 - cells
 - bushes
 - ferns
 - fossils
 - fungi

Now knowing that cells vary in size as well as shape, but all cells are very small and all cells are microscopic in size, choose the best answer.


 

    cells     