Its rotting carcass. Biotic factors are living things in an enviroment. I dont even know what a carcass is but i know that a rock, a drop of water and fire arent living.
i do believe the answer is d for one wheat and other barley products are not made of fats but carbs. and they are really good for energy because it can be broken down alot slower than many other energy sources.. hope this helps.
