"DNA Polymerase is responsible for: A. linking the short sections of the lagging side. B. unwinding and separating the DNA strands. C. keeping the strands separated during replication. D. adding the new bases."

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?