The cell cycle is the series of events that take place in a cell leading to its division and duplication (replication) that produces two daughter cells. What is a possible valid conclusion if
the S phase is removed from the cell cycle?
Plasma membranes will dissociate into their component parts.
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O Chromosome duplication and replication of DNA will not occur.
Ribosomes will increase the production of proteins.
Lysosome and Golgi body production will increase greatly.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

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.