How are selective breeding and natural selection similar how are they different?

Selective breeding and natural selection are similar  because  they are both giving certain traits to offspring.
DIFFERENCE: 
natural selection-Process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest
selective breeding-Selection by humans for breeding of useful traits from the natural variation among different organisms

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.