What does this below rebus puzzle mean?

What does it mean?

People make me, save me, change me, raise me. What am I?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Why is a river so rich ?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

There are forty elephants and they have forty-fore heads. How can this be possible?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

Imagine you are in a room with no windows or doors. How will you get out?