I think the second option is the best (by making the ramps height and length equal) because the first option will require more pushing, the third option will only make the ramp lighter which could cause it to not stay in place, the last option would make it harder to push the boxes up because the rubber will make it harder to slide the boxes up. I hope this helps:)
Answer:
What do you mean by I control all metabolic activities of the cell
Answer:
refrain from using or disposing of (something); retain for future use.
Explanation:
