Which functions of life are found in all unicellular organisms?
a. growth, response and nutrition
b. differentiation, response and nutrition
c. metabolism, meiosis and homeostasis
d. growth, metabolism and differentiation

answer; ///(b) it is composed of four protein chains and four heme groups;

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