Grain is used to feed cattle and livestock because it is healthy, cheap, ethical, and easy to grow in some American climates. Grain is the easiest and most cost-efficient way to feed livestock.
Answer:
From top to bottom:
Explanation:
B.
B. (Although this one could also be C. depending on the unit you're on, but I'm guessing it's this one over the other)
A.
Answer:
If you meant invent then it is Friedrich Ludwig Jahn.
Explanation: