Which phrase is the best summary of the model shown? a. the breakdown of food molecules b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the transfer of the sun's energy through trophic levels

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?