Carbohydrates are a very important source of glucose (sugar).
The monomers of carbohydrates are called monosaccharides.
Lipids are also known as fats and oils.
The two building blocks of lipids are one glycerol molecule and one fatty acid.
The three functions of lipids are to make hormones, enzymes, and antibodies. They are long-term energy storage. They are chemical messengers that aide enzymes when enzymes fasten chemical reactions.
The third and fourth one definitely
The formula for density is:
Density= mass/ volume
Which means the formula for volume will be;
Volume= mass/ density
Which means the formula for volume will be
You were given the density as 13.54g/cm3 and the mass as 40gm. Just use them in the formula. That will be
Volume= 40/13.54
And that is 2.95 which is A. Hope I helped. Have a nice day