Things would be a lot different. Children would be identical to their parents. Mitosis copies a cell and its DNA so the child's DNA would be identical to the parents and they would look exactly alike. It would be like a lot of twins walking around. That is assuming there are no mutations in the mitosis process. I feel like there would be a lot of pitfalls in a population of humans if mitosis were the primary method of reproduction. Everyone will be like a copy of someone else and there will be no room for differences. This would cause a lot of problems with the population because it would be so much different than it is now. Everyone would asexually reproduce and there would be less sexual reproduction. This would probably lead to many problems that I can't even think of.
Sorry I can't explain it better because i'm only in 8'th grade.
It's a symbiotic relationship beneficial to both symbionts.
in this case E. Coli helps with the absorption of Vitamin K and other important vitamins for the human body in the colon. While, Human (host) provides shelter for it
