Why are compounds different from single elements? a when elements form a compound, the bonds and structure of the elements change. b when elements form a compound, the masses of the elements increase. c when elements form a compound, the masses of the elements decrease. d when the elements form a compound nothing is different.

cats ; snakes

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )

when it is at an intermediate population density

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.