Answer:
A monosaccharide is the most basic form of sugar( carbohydrates) which is formed by the the combination of glycosidic bonds to form larger carbohydrates.
An oligiosaccharide is one which has only 20 monosaccharide in it. A monosaccharide is a type of monomer which can combine together to form a polymer.
The monosaccharides combine to each other by the help of glycosidic bonds.