Basically, the fox tricked the bird into dropping the meat. The crow felt the need to prove itself to the fox, therefore losing what it had already achieved. I hope that helps you understand!
Research can be used to prove something true is tell factual info about something! Research is conducted in a wide variety of topics from illnesses to animals etc.
A.wait ,because they have to see if you are a threat to them.
The passing of childhood, the author implies our childhood and the sun is implying that childhood passes us without us even know that or childhood is over. hope this helped