IS your tongue breaking pieces of a hamburger apart a physical change or a chemical change

Mechanical Digestion = Physical Change Takes place inside the mouth where teeth and tongue breakdown food. So in short, Physical Change.

it’s both physical and chemical

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms