Tensile Strength:
Tensile strength is a measure of the maximum stress that a material can withstand before breaking under tension. It indicates the ability of a material to resist being pulled apart by opposing forces.

Spider Silk:
Spider silk is known for its exceptional tensile strength. It is one of the strongest natural fibers found in nature. The silk is produced by spiders to build their webs, which serve as their hunting grounds or shelters. Spider silk is made up of protein molecules that are arranged in a specific pattern, giving it its unique strength.

Comparison with Cotton and Wool:
Cotton and wool are also natural fibers, but they do not possess the same level of tensile strength as spider silk.

Cotton:
Cotton fibers are derived from the cotton plant. They are soft and breathable, making them suitable for clothing and textiles. However, cotton has a relatively low tensile strength compared to spider silk. Cotton fibers can break easily under tension and are not as strong as spider silk.

Wool:
Wool is derived from the fleece of sheep or other animals. It is known for its warmth and insulation properties. However, wool fibers are not as strong as spider silk in terms of tensile strength. While wool can withstand some tension, it is not as durable or strong as spider silk.

Conclusion:
In conclusion, among the given options, spider silk has the greatest tensile strength. Spider silk is known for its exceptional strength and is one of the strongest natural fibers found in nature. Cotton and wool, while useful in their respective applications, do not possess the same level of tensile strength as spider silk.