I don't know if you're looking for an answer from someone on here, or for an assignment of some sort. In my opinion; If there is a history of something like a disease or cancer in the genes throughout the family, then yes I think it is perfectly fine. If it is being done for a reason other than to help someone in a way, it's not the best thing to do.
I Think that's the equator
These 3 things occur on the plate boundaries (area between plates).
The cell membrane has selective permeability and chooses which to pass through. Non polar molecules can pass easily with diffusion, but ions cannot.
