Can we please please help

What happens when the cell copies its chromosomes

What is the name of the type of cell division that occurs in the prokaryotic cell cycle

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?