Which of these is an example of a chemical change?

a. leaving cheese out to get moldy
b. smelling sprayed perfume
c. feeling ice melt on your skin
d. crushing ice with a hammer

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.