If cell g7 contains the function it states that if the value in cell c3 is 9, the number 7 will be assigned to cell g7; if the value in cell c3 is not 9, the number 4 will be assigned to cell g7. =if(g7=7)=then(c3=9)=or(c3=4) =if(c3=9,7,4) =if(g7=9)(g7=7)=or(g7=4) =if(c3=9)(c3=7)=or(c3=4)

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

c. is the correct answer

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.