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

Fact 2: Bacteria are single-celled animals.

Given the two facts above, answer the question "Bacteria are?" with the following options: 
- larger than giraffes
 - negative
 - bigger than the Sun
 - very small
 - contamination
 - very large
 - survive
 - genus


 

    very small     