There are many reasons why the use of oil needs to be managed carefully. Which of the following is not one of these reasons? A- burning oil contributes to acid rain and the greenhouse effect

B- Oil was created by plants and animals

C- Oil spills at sea babe killed many marine animals

D- There are only limited supplies of oil in the earth

Explanation:

letter b.oil was created by plants and animals diyan po sagot

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.