Answer:
It's in your hand though you can not feel it. Only you and time can reveal it.
I am a busy worker who is a water mammal.
I am black white and read all over.
I am owned by every man though my length differs. Their wives uses me after getting married.
I ask no questions but receive a lot of answers. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.