Stem cells could potentially be used as a source of renewable healthy cells and tissues.
cure diseases,
which human activity is correctly paired with its likely future consequence
They do not treat all diseases. For the diseases they can treat the embryonic cells can provide replacements for the failing (or entirely missing) cells that due to their absence cause the disease.
white blood cells
they can cure human diseases but the question is should we use them.
it has more human cells actually the human body has more bacterial cells. Although it may seem more likely that the human body would have more human cells than bacterial cells. -Vasillisa
In the near future, we may create chloroplasts in human cells, which can help to photosynthesize.
It varies ... from a few minutes to the rest of your life.
More than Billions of cells are present in the average human's body . In case of diseases like cancer of blood or situations like increase in number of WBC ( white blood cells ) ,etc .
Genetic modification of human embryonic stem cells is against the law because it can give way to unwanted mutations and diseases.
Somatic cells are body cells. Genetically modifying them might have an influence of the subject on which the procedure was carried out but will not have any direct influence on future generations. Genetic alternation of germ cells however, will have an effect on future generations.
No, human cells can reproduce almost indefinitely in cell culture. Biologists have been doing this for decades with HeLa cells. Another answer: A company grows human skin for replacing skin burned away on burn victims. Stem cells are replicated for research purposes. They have been used in attempts to treat diseases. In the future, many will probably be used in bone marrow transplants. (Your liver is always renewing itself. I do not know why I have not heard about scientists reproducing liver cells outside of the body.)