I wonder how much of the United States income comes from agriculture.
I'm not sure, but agriculture is so important for sustaining life.
Without it we wouldn't have nearly as much food.
Yep, it involves culitvation and breeding of plants and animals.
What tools and machines do we use to accomplish this?
Nowadays we must use things like harvesters and tractors to plant and cultivate plants.
What did we use in older times?
Things like hoes and rakes and all that to cultivate and plant the seeds and plants.
It seems that our methods have come a long way.
Without a doubt, agriculture has come a really long way since back then when we bred animals and planted seeds really primitively.