Spider webs are made up of ______, a natural fibre made up of protein.

silk

The correct answer is Option (3) -silk

Spider webs are made up of silk, a natural fibre made up of protein.

Spider silk is an incredibly strong and versatile material produced by spiders from special glands in their abdomen. It's much stronger than steel of the same thickness and has a high degree of elasticity. Spiders use silk for a variety of purposes, including building webs to catch prey, creating egg sacs, and protecting themselves from predators.