Como se liberan a la atmosfera, los hidrocarburos procedentes de la quema de combustibles fósiles generan ozono troposferico. Por lo tanto, ¿son contaminantes primarios o secundarios?

it restores trees to areas where they once grew.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.