Question

however, the science that explains why some people love roller - coasters may also explain why other people dont enjoy the experience at all. some scientists believe that certain peoples brains might contain more of a chemical that drives them to seek out thrills like roller - coasters, bungee jumping, or rock climbing. people who have less of this chemical also have less of a desire to find the fastest roller - coaster or the biggest, most stomach - churning drop. plus, studies suggest that thrill - seeking behavior declines after early adulthood. therefore, older adults may be less likely to look for things like roller - coasters to give them a dose of excitement.
but for those seeking the outermost of a looping, swirling ride, there is no
what does the fourth paragraph do?
it explains why some people might not enjoy roller - coasters.
it gives background information on the history of roller - coasters.
it summarizes the authors main claim.
it explains why roller - coasters are better than bungee jumping.

Explanation:

The paragraph discusses brain - chemicals and age - related factors that make some people not enjoy roller coasters.

Answer:

It explains why some people might not enjoy roller coasters.