Answer:
agriculture:
it grows crops, which keep you feeded, and watered.
back in like B.C. and B.C.E(same era of time, just different names) farmers could trade crops for building tools which would help expand their civilizations
provides dairy, meat, and food.
D. The poets unity with the natural world
Reason: I got it right in OW

Would be the expression. To solve, divide 10 by 2 to get 5 and 50 by 5 to get 10. Subtract 5 - 10 to get -5.