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

Fact 2: Cells are the fundamental units of life.

Given the two facts above, answer the question "The fundamental units of life vary in size and shape but are all very what?" with the following options: 
- elastic
 - large
 - dry
 - fat
 - visible to the naked eye
 - complex
 - small
 - matter


 

       small  