Answer:
Grain, species etc..
Explanation:
They were originally used to grind grain or spices or pump water and sawing wood. Now modern windmills are used for electricity.
I think its A. If you had options like mine
<span>Herbivores posses different digestive system than that of carnivores. In the course of evolution herbivory evolved with a complex digestive tract. There is no cannine teeth for herbivores. The stomach contains billions of bacteria. The intestine is 27 times longer in length than the length of its body.</span>
