Macromolecules contain large number of atoms. Milk contains
both carbohydrates and proteins, because it gave a positive result upon the
addition of Benedict’s solution which indicated an orange color. It means that
there is a concentration of reducing sugars in milk.
A synecdoche is a figure of speech by which a part is used to represent the whole and in this sentence the “plastic” is a part of the credit card but is used to represent the credit card in its entirety.