Systems continuously undergo rapid change and improvement. Describe the relationship between systems thinking, side effects, systems evolve, and efficiency? Include a system in real life to explain your answer.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.