You are presented with the question "Cartilage is a tough tissue made up of:" and the following answer choices: 
- a cuticle
 - bones
 - Joules
 - neurons
 - the skin
 - loose soil
 - fibrils
 - muscle

Now knowing that cartilage is a tough tissue that contains a protein called collagen and many collagen fibrils come together and form a collagen and forma collagen fiber, choose the best answer.


 

       fibrils  