Rough ER<span> looks like sheets or disks of bumpy membranes while </span>smooth ER<span> looks more like tubes. </span>Rough ER<span> is called </span>rough<span> because it has ribosomes attached to its surface. The double membranes of </span>smooth<span> and </span>rough ER<span> form sacs called cisternae.</span>
Explanation:
As I think vector is the correct one.
The greenhouse effect is Earth's greenhouse gasses trapping the sun's heat. <em>It helps keep the temperature in the atmosphere stable for life. </em>
