Please fill in all of the blanks. Protein synthesis actually begins in the _1_ when DNA transcribes __2__.  Messenger-RNA is a copy of a __3__, which is the instructions for how to make a __4__.  After modifications are made, the mRNA leaves the nucleus and travels to the __5__.  As each __6__ of the mRNA is read by the ribosomes, the proper __7__ is brought to the ribosome.  Molecules of __8__ are responsible for delivering __9__ to the ribosomes.  As the amino acids are lined up, they are joined together by __10__ bonds.  ​

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.