What is the job of the tendons?
to connect bones to each other
to stretch spongy bone
to keep bones from rubbing against each other
to attach muscles to bones

Option D, To attach muscles to bones

Explanation:

Tendons are basically a form of connective tissue that establishes a connection between the muscle or bone. They help in the movement of bones of our body. Tendon is made up of collagen, proteoglycan matrix and fibroblast arranged in parallel layers thereby forming a flexible and tightly packed fibrous tissue which helps in the bio mechanical movement of bones and joints.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms