Answer:
<h3>Biologists study humans, plants, animals, and the environments in which they live. They may conduct their studies--human medical research, plant research, animal research, environmental system research--at the cellular level or the ecosystem level or anywhere in between.</h3>
<h2>Answer:</h2>
B. Decreases
<h2>Explanation:</h2>
According to the golden rules of business when the supply increases with the demand, the prices are reduced by the suppliers because manufacturing cost of a single product is very costly as compared to the manufacturing cost of a bulk of products. The same rule is applied to the purchaser if he purchases bulk of products, the cost will decrease.