You are presented with the question "Bacteria are?" and the following answer choices: 
- larger than giraffes
 - negative
 - bigger than the Sun
 - very small
 - contamination
 - very large
 - survive
 - genus

Now knowing that cells vary in size as well as shape, but all cells are very small and bacteria are single-celled animals, choose the best answer.


 

    very small     