A. 4 examples of macronutrients
b. 2 examples of micronutrients

Macronutrients: water, fat, carbohydrates, protein
Micronutrients: minerals, vitamins

Explanation:
The six types of nutrients humans need are water, fat, carbohydrates, protein, minerals, and vitamins.

Macronutrients are nutrients we need in large amounts (macro- means big).
Micronutrients are nutrients we need in small amount (micro- means small).

Consider what you eat in a day, you (should) be getting all of these.

It's recommended you have about 8 cups of water a day, which is a large amount.
Fat and carbohydrates are used as sources of energy and are consumed in large amounts.
Proteins (meats, nuts) used to build muscle are also eaten in large amount.

Minerals and vitamins have recommended intakes of milligrams (mg) which is a very small amount. They are found in traces in our food. For example, you would not fill your entire palm with calcium and eat it. You only need small amounts of calcium (probably in your milk).