Your best friend has been feeling sad for more than two weeks, and you are concerned that he may be experiencing depression. how can you have a positive impact on his life to him get healthy again?

Become a positive influence.

Try to do things that made them happy like their favorite activity or watch their favorite show.

Do small things of affection because those eventually add up.

Ask everything in your power to make them feel loved as you more than likely do.

Hope this helps!

Olfactory epithelium i believe