it depends if a line has arrows on both ends its going to go on forever but if it has a dot on both ends it stops completely on both sides now the line can have an arrow on 1 side that means that side will go on forever but the other end could have a dot so that means it stops on that side completely.
It is called a circle.
No. A geometric line has no beginning or end. A ray has a beginning, but no end. A line segment has both a beginning and an end.
If the "line" has a direction, it is a vector. Algebraic "lines" have no end nor beginning and so cannot "go" down nor up.
No A line segment has a beginning and an end, but a line has no beginning or end. A ray has a beginning but no end.
Time
It is a line segment.
The answer is historical. It's a quote from WW2. Prime Minister Winston Churchill made the statement "Now this is not the end. It is not even the beginning of the end. but it is, perhaps, the end of the beginning." Nov 10 1942
A ray.
There is neither a beginning nor an end , but a constant change between beginning and end, between birth and death, which then produces new life...
Because it is a cycle
line segment
The simplest ws to move your insertion point to the beginning and end of a text line is just to click there. To move your insertion point to the beginning of a document, press ctrl+home, and to move it to the end of a document, press ctrl+end on your keyboard.