Its organism because it is one single thing.
The difference between the two students that we know of is that they used a different meter stick. So the difference would be best attributed to the different tools they used.
Note, this is quite a huge difference. It's likely that one of the sticks, or both, are quite defect.
Jet streams are fast moving air currents much like how a river is a fast moving water current so the answer is jet streams.
They are biodegradable and non biodegradable <span />