Wait this is highschool biology?!
Woah... thought it would be harder....
Anyways, see "micro" means really small, so small that your bare eyesight can't take it (or see it, I don't care). A microscope was meant to see things that our eyes can't. Since humans cant see microlife we use a microscope.
Mind Blown...
Your answer is C.
Not all systems perform the same function or use the same organs.
All living things have cells, they reproduce, they more in some king of
way/ grow, and they use energy from some sort of water and food.
