Why carbohydrates are considered as one of the molecules of life?

Carbohydrates are considered one of the molecules of life because they serve as a primary source of energy for living organisms. They play crucial roles in cellular structure, such as in the formation of cell walls in plants through cellulose, and they participate in cell signaling and recognition processes. Additionally, carbohydrates are involved in the storage of energy, with glycogen in animals and starch in plants, making them essential for various biological functions.