Bacteria is the simplest of cells. one special feature of bacterial cells that it survive in hostile environments is its

One feature that enables some bacteria to survive in hostile or adverse conditions is the ability to form endospores. An endospore is a tough , non reproductive structure produced or formed by some bacteria from the Firmicute family.

The primary or main function of most endospores is to ensure the bacteria survives during periods of environmental stress. Endospores are resistant to starvation, chemical disinfectants, high or low temperatures, ultraviolet and gamma radiation. Endospores are commonly found in soil and water, where they may survive for lengthy  periods of time.

Other bacteria when faced with decline or exhaustion of favored nutrients will become motile to seek out nutrients or they will produce new enzymes to enable them use alternative resources.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.

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.