____________________ are used to lengthen one line by bending one to another.

Splices are a method used to join two lines together in order to create a longer line or to form connections between ropes. This technique involves intertwining the fibers of the two lines, which provides a strong and durable bond that maintains much of the original strength of the rope. Splicing can be used for various types of ropes and is particularly useful in marine applications, such as when rigging sailboats or securing equipment on a vessel.

Other methods like knots are typically used to secure lines or create loops but may not always provide the same level of strength or reliability as a splice. Loops and bights refer more to specific formations or portions of line rather than methods for connecting two separate lines. Therefore, the primary purpose of splicing aligns perfectly with the need to lenghten one line by securely connecting it to another.