Natural polymers are polymers that occur naturally in living organisms. They are derived from renewable resources and are biodegradable. Cellulose, starch, resins, and rubber are all examples of natural polymers.

- "Natural polymers" category explanation
Natural polymers are polymers that are found in nature. They are formed through natural processes and are typically derived from renewable resources such as plants and animals. These polymers have been used by humans for thousands of years for various purposes.

- "Cellulose" explanation
Cellulose is a natural polymer found in the cell walls of plants. It is the most abundant natural polymer on Earth and is the main structural component of plant cell walls. Cellulose is a complex carbohydrate made up of repeating units of glucose. It provides strength and rigidity to plant cells and is also used in the production of paper, textiles, and other products.

- "Starch" explanation
Starch is another natural polymer that is found in plants. It is a complex carbohydrate made up of glucose units. Starch serves as a storage form of energy in plants and is the main component of many staple foods such as potatoes, rice, and wheat. It is also used in various industrial applications, such as in the production of bioplastics and as a thickening agent in food products.

- "Resins" explanation
Resins are natural polymers that are produced by plants as a defense mechanism against insects and pathogens. They are usually sticky substances that harden upon exposure to air. Resins have been used by humans for thousands of years for various purposes, such as in the production of adhesives, varnishes, and coatings.

- "Rubber" explanation
Rubber is a natural polymer that is derived from the latex sap of certain plants, most notably the rubber tree. It is a type of elastomer that exhibits elastic properties. Rubber has many commercial applications, including in the production of tires, rubber bands, and various rubber products.

In conclusion, cellulose, starch, resins, and rubber are all examples of natural polymers. They are derived from renewable resources and occur naturally in living organisms. These polymers have a wide range of applications in various industries, and their natural origin makes them biodegradable and environmentally friendly.