Which of the following is true about cells? a. cells have specialized components that perform different, specific functions. b. a cell's components are all identical and perform the same function. c. a cell has a single component that performs all of the cell's different, specific functions. d. cells have specialized components that all perform the same functions.

A.

Cells have specialized components that perform different, specific functions.

b.transmitters send radio waves, and receivers capture radio waves.

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