Cartilage is a tough tissue that contains a protein called collagen.
Collagen tissue is made by collagen fibers connected by bridges.
Cartilage is a tough tissue  made by fibers connected by bridges.
What is a tough tissue made by fibers connected by bridges?
Options:
* a prism
* bones
* arms
* roots
* skin
* homogenous
* cartilage
* alveoli