If bacteria double their numbers in a short time if there are 2 bacteria in 20 minutes, how many bacteria will now be in 200 minutes?

A. 40
B. 1024
C. 200
D. 22

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?