A line is an endless collection of points that follow a straight path. there is no start and finish and there are no curves.
"imaginary" does not describe a line by definition because lines are definite points, not imaginary ones. "endless" does describe a line because, as stated, they have no start or finish. "curved" does not describe a line, because lines follow a straight path. "has no width" describes a line accurately because lines are one dimensional; when we imagine a line, we visualize it by drawing one with a certain width, but in geometry, lines do not have any width. it's just a representation. a line additionally does not "have two endpoints"--that would be a line segment, with a starting point and a finishing point. lines go on forever in both directions, so you wouldn't be able to find endpoints for it.
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Some resources are inexhaustible or perpetually renewable, others are nonrenewable, and still others are renewable if we do not overexploit them. Ecosystem ervices are benefits we receive from the processes and normal functioning of natural systems. Resources and ecosystem services are essential to human life and civilization, yet we are depleting and degrading them.
You might expect to find the aquifer "near the groundwater" (: