List one component of the cell membrane and describe how it contributes to the function of the cell.

Cell Membrane

Explanation:

its one of the most important component as it keeps the protoplasm together. Also it is a selectively permeable membrane that allows needed material to pass into the cell. It also gives some level of protection to cell from outside environment

the answer is c. it will give up it's valence electron to the other atom.

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.