What occurs during the synthesis stage of the cell cycle? A. The cell grows, but keeps the same amount of chromosomes.
B. The cell shrinks, but keep the same amount of chromosomes.
C. All DNA is copied, doubling the number of chromosomes.
D. The cell spits, reducing the number of chromosomes by half.

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?