Answer:
The smallest basic unit of living things. They vary in shape, appearance and size depending on the type of organism and the function of those cells. The smallest cell, Mycoplasma or PPLO (Pleuropneumonia - like organism), is about 0.1 - 0.25 m in size.
Explanation:
Katrina learned about curling by watching and focusing on the techniques used by the olympic players. By watching so much, she learned the movements and basic rules of the game. This is an example of visual learning which is also cognitive learning :-)