A stream can't reproduce, but it does replenish; since it flows from someplace and to another, it is constantly being renewed.
Fast moving stream
A fast-moving stream is called a river or a torrent.
Yes, a fast-moving stream uses energy to maintain its flow velocity. The energy comes from gravity, which causes the water to flow downhill and overcome resistance from friction with the stream bed and banks.
No, it does not
a riffle is a short fast moving stream.
A stream flowing down a mountain is moving to fast to form meanders.
deposition
When the water from the stream flows onto a flat plain it countines to flow but not as fast as before it becomes a slow moving stream. It may even become completely still.
When the water from the stream flows onto a flat plain it countines to flow but not as fast as before it becomes a slow moving stream. It may even become completely still.
Rubbing against rocks along the stream channel
No, a fast moving stream is not made of cells. A stream is a body of water running in a channel, typically flowing towards a larger body of water like a river or ocean. Cells are the basic structural and functional units of living organisms.
The "jet stream".