Why do animals in cold regions have a layer of fat below their skin?

What enables the ear pinna to be folded and twisted while the nose tip can't be twisted?

Supriya stepped out into the bright street from a cinema theatre. In response, her eye pupil shrunk. Identify the muscle responsible for the same.

With help of a neat labelled diagram, describe the structure of areolar connective tissue.

Describe the structure of multipolar neuron.

Distinguish between smooth muscle and skeletal muscles.