Scientific inquiry is not easy to implement because of several factors. one of the problems is taking into consideration all (data, variables, observations) and deciding which ones to standardize. another problem investigators face during experimentation lies in , observing, interpreting) the evidence.

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?