Trade is when two or more people exchange items such as food , money , books and etc...
When our country = America ( USA ) trades goods such as money , or food and medical supplies to other countries ( Nations ) to help them and in return we might get more supporters or better Technology.
I really hope that this helps you out a lot.
It's called condensation.
The correct answer is through visions of an angel. He received his message from Allah on Mount Hira from the angel Jibral.
Trash is a consequence of teaching a test