Achange in refers to a movement along the demand curve for cars in response to changes in the price of cars, whereas a change in refers to a shift of the demand curve for cars leftward or rightward in response to anything other than changes in the price of cars.

quantity demanded; demand

Explanation:

The difference between demand and quantity demanded is that demand is the whole curve that relates possible prices to certain quantities, while demanded quantity means a specific point in the curve relating price to quantity. For this reason, we can conclude that  a change in quantity demanded refers to a movement along the demand curve for cars in response to changes in the price of cars, whereas a change in demand refers to a shift of the demand curve for cars leftward or rightward in response to anything other than changes in the price of cars.

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clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

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