Smooth ER is largely associated with lipids as well as the following:Phospholipids as in plasma membranes, and steroids.So the answer is (B)
Normal cells listen to signals from neighboring cells and stop growing when they encroach on nearby tissues (something called contact inhibition.) Cancer cells ignore these cells and invade nearby tissues. Benign (non-cancerous) tumors have a fibrous capsule.
Answer:
Spider has a circulatory system
