Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
What goes up let's of a load and come back down
I start with āeā end with āeā. I have whole countries inside me. What am I?
Brothers and sisters I have none but this man's father is my father's son. Who is the man?
The thinkers usually hold this body part
I start with T end with T and within me is T.