The adoption of which two practices to increase the amount of food produced per unit area of farmland?

four-field crop rotation

the application of chemical pesticides

the use of steam-powered tractors

land irrigation using steam-powered pumps

selective livestock breeding

Look closely at the sculpture and label below. which of the following is the most accurate argument based on this information

Which was the cause of the rise of the persian empire?

Which of the following world and national events led to a new view of people with disabilities in the us:     a.  world war i and ii veterans with disabilities returned home after the wars.b.  john f. kennedy was elected president and had a sister with a disability.c.  the civil rights and feminist movements.d.  all of the above.