Answer: B. From the sun.
Most producers absorb energy from the sun.
If you mean a specific system then the reproductive system...but i haven't the slightest idea as to anything else to do with your question...
They're attached to the plasma membrane.
(it's at the midpoint of the cell.)
Explanation:
Ice crystals in meat signify that it is frozen,a bunch of water molecules within the food form to keep the meat hydrated .
I hope it's helpful!