According to piaget, children have acquired the cognitive skill of conservation when they're able to
a. understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal.
b. realize that the term heavy describes an object one way and the term big describes it another way.
c. understand the viewpoint of other people.
d. relate objects around them to their own needs.

According to Piaget, children have acquired the cognitive skill of conservation when they're able to understand that six ounces of liquid in a jar and six ounces in an elongated tube are equal.

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.