What do disaccharides, such as sucrose, and polysaccharides, such as starch, have in common?

A Disaccharides is defined as  a molecule formed from a combination of two monosaccharaides.

A polysaccharide is a polymer consisting of 10 or more monosaccharaides joined together . The bonds formed between the  monosaccharide units are known as glycosidic bonds.

Both polysaccharides and disaccharides are sugars and can be cleaved  to monosaccharide's through  hydrolysis and phosphorolysis .

Both polysacahrides and disaccharides are formed  by combining their constituent  sugars  through a reaction known as a condensation reaction which results in formation of a glycosidic bond.

b. read the phase at the intersection of any given temperature and pressure.