Question 2
a carbohydrate energy storage molecule found in animal liver and muscle cells is:

Glycogen

Explanation:

Glycogen is a storage polysaccharide, which means it is made up of a chain of many monosaccharides. It is a storage polysaccharide because it is stored in the liver and muscle cells to be used as a source of energy later on.

Our body uses glucose for energy, but when it is not used up, it is stored in the liver and made into glycogen. When the body needs an extra boost of energy, it will use glycogen, especially when there is no other source like glucose, around.

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.