Among the topics addressed are migration, acid precipitation, changes in salmon population, the effects of introduced species on an ecosystem, food chains, and fish adaptations.
(the topics; addressed; ) (Among the topics; are; migration, acid precipitation, changes in salmon population, the effects of introduced species on an ecosystem, food chains, and fish adaptations)
the topics Among the topics
addressed are
migration, acid precipitation, changes in salmon population, the effects of introduced species on an ecosystem, food chains, and fish adaptations