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A line is a series of points extending infinitely in opposite directions. Because a single point has no dimension we get only one dimension when we line the points up.
A straight line with no end points such as the number line
Yes. Infinitely may points.
A straight line of infinite length!
Opposite rays are halves of a line. There is one endpoint and the two rays extend infinitely from it in opposite directions. The endpoint can actually be any point on the line, but it can be assumed to be the midpoint.