Which of these describes the structure of the endoplasmic reticulum? A. A system of folded membranes
B. A tiny organelle that has. o membrane.
C. a rigid, protective layer found outside the cell membrane.
D. an organelle surrounded by a double membrane containing dna.

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?