What happens when sperm capacitate?

Capacitation of sperm or spermatozoon is a process of functional maturation. The changes occur in the cell membrane of the sperm cells.

The removal of the layer of glycoprotein takes place in the capacitation process of sperm that result in making receptors available.

The other change that takes place is the alteration of the acrosomal cap that helps in acrosome reaction possible. These changes help in the sperms to penetrate and fertilize the egg in the female reproductive tract.

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.