Carbohydrates and proteins are built up from their basic building blocks by the a. removal of a nitrogen atom between each two units b. addition of a water molecule between each two units c. removal of a water molecule between each two units d. addition of a carbon atom between each two units

elements

explanation:

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.