Their roots are near the surface, where they have access to oxygen.
The answer would be A packing becomes less tight. The double bounds create kinks in the chain making it harder for the chains to back tightly
As a noun one response to the entire physiological process activating such a movement free any automatic I’m thinking often habitual behavior or response or reflection or image of an object as exhibited by a mirror or the like
In pie charts, most often displayed is the proportion of certain data to each other.