Demand is the amount of a product customers are prepared to buy at different prices. Supply is the amount of a product businesses are prepared to sell at different prices. There are many different types of market. The goods market is where everyday products such as DVDs are traded.
The respiratory and circulatory systems bring oxygen and nutrients to the cells. The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood.
