Hank explains that biological molecules are essential sources of energy. They are used for energy storage and are the instructions that help organisms grow. Biological molecules are found in carbohydrates, lipids, and proteins. Hank uses biological molecules to explain why humans don't eat grass and how humans get energy from bread. Key Words: Sugars, Monosaccharides, Glucose, Fructose, Disaccharides, Sucrose, Polysaccharides, Cellulose, Glycogen

Hank explains the different types of nutrients that our body needs: water, vitamins, minerals, carbohydrates, lipids (fats), and proteins. He explains what each type of nutrient is used for and how it's used by the body.

Hank explains how DNA and three specialized versions of RNA synthesize proteins. He delves into the process of transcription, which involves copying genetic information from DNA to RNA.

This clip explains how eggs, lean meat, milk, beans, and nuts contain high amounts of protein.

Sophie explains why we eat food: to ingest chemicals such as nutrients. She dissects a salad to illustrate the different types of nutrients our body needs: carbohydrates, proteins, and fats. She provides an example of each type of nutrient.