Either is correct.
Commerce
turbidity currents
Stars are incredibly bright objects. Since there is barely anything to block off their light, you can see them at very large distances.
That it is difficult for them to walk long distances.
albatross.
Short distances Medium distances and Long distances
It made it easier to carry large cargo long distances across the ocean faster.
measuring the distances
They aren't. Bikes are more suitable for long distances.
So the quote is supposedly by Thomas Edison. It means that if you have a goal (say, doing a decathlon within the next six months) and you do nothing to achieve that goal, (in this case, train by running long distances, swimming long distances, biking long distances) you might as well be hallucinating or daydreaming about getting to the goal.
Because it is a large number, suitable for large distances. Astronomers also like to use the unit Parsec.
The axon is the part of the neuron that can carry information for long distances.