A farmer has developed a new type of fertilizer. This new fertilizer costs 20 percent more to produce than the old fertilizer but has better results: The
same land now produces 25 percent more crops each year.
Which statement best describes one way the farm will be affected by using
this new fertilizer?
A. The farm's marginal cost for fertilizer will decrease.
O B. The farm's opportunity cost for using fertilizer will increase.
OC. The farm's marginal cost for fertilizer will increase.
D. The farm's opportunity cost for using fertilizer will decrease.

Aresearcher conducts a focus group to learn about attitudes towards hygiene and disease prevention. two weeks after the focus group, the researcher learns one of the subjects had a heart attack at home and was hospitalized, but made a full recovery. based on dhs regulations, the researcher report this event to the irb? no, this does not need to be reported since the subject had the heart attack when they were home, not at the focus group. no, this does not need to be reported since it is unrelated to participation in the study. no, this does not need to be reported because two weeks have passed. no, this does not need to be reported since the subject recovered.

What period of history refers to the time when people did not have written records

Which type of learning occurs when you observe how other people act?