Question

how long do you think it takes for bacteria to double?
twenty hours
twenty days
twenty seconds
twenty minutes

Explanation:

Bacteria generally have a relatively fast - growth rate. Under optimal conditions, many common bacteria can double in number within 20 minutes. 20 hours and 20 days are too long for bacteria to double, and 20 seconds is too short for most bacteria's growth cycle.

Answer:

D. Twenty minutes