It became apparent to watson and crick after completion of their model that the dna molecule could carry a vast amount of hereditary information. which of the following characteristics of dna is responsible for this?

The correct answer is- sequence of bases

Explanation:

Watson and Crick demonstrated that DNA is a double-stranded molecules which are joined together by hydrogen bonds between the complementary base pairs present on opposite strands.  

The genetic information is present in the DNA in the form of a sequence of bases. These base sequences are transcribed during the transcription process and translated in the translation process. During translation, the bases are expressed in the form of proteins.

The DNA can be transferred from parent to daughter cells so DNA could carry a large amount of hereditary information.

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.