Cellulose
Cellulose is the most abundant organic molecule present on earth. It is a polysaccharide made up of repeating units of glucose molecules linked together. Cellulose is a structural component of the cell walls of plants, providing rigidity and support.

Importance of Cellulose
- Cellulose is crucial for plant structure and support, as it forms the framework of the cell walls.
- It is a major component of dietary fiber, essential for proper digestion and maintaining a healthy gut.
- Cellulose is also used in various industries, such as paper and textile production.

Abundance of Cellulose
- Plants are the primary source of cellulose, and since plants are abundant on earth, cellulose is the most widespread organic molecule.
- Cellulose can be found in a variety of plant-based materials, such as wood, cotton, and fruits.

Comparison with other Organic Molecules
- While proteins, lipids, and steroids are also essential organic molecules, they are not as abundant as cellulose.
- Proteins are important for various biological functions, lipids are crucial for energy storage and cell membrane structure, and steroids have regulatory roles in the body.
In conclusion, cellulose stands out as the most abundant organic molecule on earth due to its widespread presence in plant cell walls and various plant-based materials.