Answer:
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
Soft and cuddly I'll pull on your heart. But take my last name and I'll tear you apart.
Brown I am and much admired. Many horses have I tried. Tire a horse and worry a man, tell me this riddle if you can. What am I?
The more you take the more you leave behind. What are they?
I can make arrows fly. I can make kites soar. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.