I know that by definition metabolism is the sum of chemical reactions that happen within each living cell and that provide energy for vital processes. But I can't really understand what definition is trying to be given in the following explanation about one of the major functions of lipids:

* Lipids are precursors of metabolically important chemicals while others are metabolically important.

What exactly does metabolically mean here?

Does it mean that lipids are substances from which substances important for sustaining life are made?

most community's take hundreds of years to become stable

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.

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.