A: Areas in the marine environment that have higher concentrations of marine pollution are USUALLY in areas where there is a lot of human activity.
(Areas in the marine environment; have; higher concentrations of marine pollution) (Areas in the marine environment that have higher concentrations of marine pollution; are; T:USUALLY; in areas)
Areas in the marine environment Areas in the marine environment that have higher concentrations of marine pollution
have are
higher concentrations of marine pollution
T:USUALLY in areas