Cross-pollination, people could do it by hand by moving the pollen, and the wind could move it. I tried
The answer would either be emissions into the air or trash from cruise ships. But i would say the answer is emissions
Stem cells are undifferentiated cells that could develop to perform a variety of tasks. One type of stem cell is the embrionic stem cell. There are also adult stem cells. To use embrionic stem cell you need to have fertilized embrios. These can be donated to research. The use of the embrionic stem cells is controversial for this reason.
Sickle-cell disease can result.
Hope this helped you.
