Answer:
Systems always tend toward a state of decreasing order unless more energy is provided into the system to counteract this tendency.
It is called observation because you observe with your nose by semlling things your eyes by looking at things your ears by hearing things your tongue by tasting things and your hands by feeling things
B: Extension Lines! You could have just searched this up on google
Typically no. Displacement can be in multiple directions as a vector. of something is traveling only along x, then it would be true though this is usually not the case.
