Misc: in what sport did the word 'crestfallen' originate?

Questions

Certain fireflies emit a light so penetrating that it can pass through ---------- and wood.?

Certain fireflies emit a light so penetrating that it can pass through flesh and---------- .?

Certain ---------- can be frozen solid then thawed, and continue living.?

Certain species of male butterflies produce scents that serve in attracting females during---------- .?

---------- favorite food is the glue on the back of stamps.?