Answer:
Q1. 4
Q2. amino acids: carbon, hydrogen, oxygen, nitrogen sometimes sulphur and phosphorous
fatty acids: Carbon, Hydrogen and Oxygen
Glucose: Carbon, Oxygen and Hydrogen
Q3. By the chemical properties in their R group
Explanation:
Q1. electronic configuration of carbon: 2,4 so it need 4 more electrons
Q2. Each of them have carbon, hydrogen and oxygen in common but do remember that each of them have different amounts of each of the elements