Which of the following vertebrate tissues would be an excellent source of collagen?

The cells of connective tissue are produced by . . . . . . .

Choose the correct option for the labelling in the given diagram $(A, B, C, D)$.

Haversian canals are found in

Given below is the diagrammatic sketch of a certain type of connective tissue. Identify the parts labelled $A, B, C$ and $D$ and select the right option about them.

External ear $(pinna)$ contains a hard, flexible structure composed of