What does the stratum granulosum contain?
dead cells
keratin
melanocytes
nails

List two limitations of natural selection

9. wind power creates pollution. water air soil noise

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?