Time when cell grows and replicates dna?

DNA replication takes place only in the S phase of the cell cycle.

In molecular biology, DNA replication is the organic means of creating two same duplicates of DNA from one original DNA molecule. This system happens in all existing organisms and is the foundation for biological inheritance.

The cells proceed to grow in G-1, S and G-2 phase. Although DNA replication takes place just in the S phase of the cell cycle.

meiosis 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.