Quotient of a variable and four B) a4 Some number to the power of four C) 4x
Four times an unknown value D) y − 4
Four more than some number E) z ÷ 4

d. the weight of the book

substitution is the answer in this case

the areas around the equator

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