15. Laura and Stevie are conducting a science experiment to identify different kinds of macromolecules in food. They prepare the following table to help them remember the chemical reactions that indicate the presence of each type of
macromolecule they're studying.
Substance Reaction
blue Benedict's solution turns green, yellow,
Sugar
or orange
Starch
brown iodine turns purple
Protein
blue Biuret solution turns pink or purple
Lipids
colorless Sudan stain turns red
Suppose that one of the substances they're testing turns bright red when they add a few drops of Sudan stain. What
is the basic molecular structure of the substance?
A glycerol combined with long chains of fatty acids
B strings of amino acids held together with peptide bonds
с short carbon chain or ring in which the ratio of carbon, hydrogen, and oxygen is 1.2.1
D polymer made up of many monosaccharides

A.glycerol combined with long chains of fatty acids

Explanation:

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.