Why is preventing pollution at its source the first strategy in minimizing environmental risk? a It is easier and more effective to prevent pollution than to clean up and dispose of waste. b. Remediation of contamination is easier than pollution prevention. c. Habitat restoration cannot be undertaken with modern technologies. d. Safe waste disposal is the easiest was to minimize environmental risk.

it would lead to upper respiratory infections and pneumonia.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.