Roferring to the reference periodic table, what do the elements fluorine, chlorine, and bromine have in
common?
a. All are located in the same

period,
b. All have metallic properties.

c. All are halogens, so they are not very chemically active,

d. Al have the same number of valence electrons,

c.All are halogens, so they are not very chemically active,

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