All materials are elastic to a point. An elastic material is one that returns to its original size and shape when the load that is causing it to bend or stretch, is removed. At some point all materials will exceed their "elastic limit".

Mild steel used for building structures is quite elastic if not over loaded. Rubber such as a rubber band is extremely elastic but it also has an elastic limit, and an ultimate strength. Glass is not very elastic and is considered brittle.

There is no one answer for this question since there are different ways to measure strength. There is absolute strength (maximum force), dynamic strength (repeated motions), elastic strength (exert force quickly), and strength endurance (withstand fatigue).

collagen fibers and resilient elastic fibers

There is no one answer for this question since there are different ways to measure strength. There is absolute strength (maximum force),

dynamic strength (repeated motions), elastic strength (exert force quickly), and strength endurance (withstand fatigue).

elastic limit