This topic understand the concept of pheromones. Pheromones are chemical substances that communicates the two individuals.

This episode understand the topic of toxic chemicals. Study of toxic substances is known as toxicology. Toxicology are mainly classified into two groups, first is acute toxicology and second are chronic toxicology.

This title understand the concept of different plants and animals. Biodiversity are derived from two words bio means life and diversity means different.