Fact 1: Cells vary in size as well as shape, but all cells are very small.

Fact 2: All cells are microscopic in size.

Given the two facts above, answer the question "What varies in shape but are all microscopic?" with the following options: 
- alveoli
 - small
 - ovaries
 - cells
 - bushes
 - ferns
 - fossils
 - fungi


 

    cells     