Answer:
This is rectangular, hollow and has a lid, and where you’ll find it you might wonder, it is just six feet under. What is it?
Metal or bone I may be, many teeth I have and always bared. Yet my bite harms no one. And ladies delight in my touch.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
A mile from end to end, yet as close to as a friend. A precious commodity, freely given. Seen on the dead and on the living. Found on the rich, poor, short and tall, but shared among children most of all.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?