The pinna of a mammal is supported by which type of cartilage?

Collagen fibres of connective tissue are

What is the function of adipose connective tissue?

Bone marrow is made up of

In the given diagram of areolar connective tissue,the different cells and parts have been marked by alphabets $(A, B, C, D)$. Choose the answer in which these alphabets correctly match with the parts and cells they indicate.

Vitamin-$C$ is primarily helpful in which of the following?