How can a piece of liver work as good as a whole liver in living donors of liver transplantation? The liver can grow back to its normal size after the donation.
How can persons be strong and healthy enough when they are left with one kidney only? The remaining kidney its perfectly caplable to boosting its activity to deliver whatever the body needs. That extra-work won't end up damaging the healthy kidney even after fifty years or more.
How can a lung be donated by a living person without harm? A healthy person can donate a part of their lung without harm because the lung can function well even if one part is removed. For instance, when living donors give a "lower lobe" of their lung, the remaining part can still provide anough oxygen for their body. This means that the donor can lead a normal life after surgery.
Can donors sell their organs? The donors don't get any money for their organ. Doctors and nurses, and donor advocates outside the transplantation team, make sure that donors are donating because they want to, not because someone is paying them.
Can a kid, a minor, become a living donor? Usually, minors are not allowed to donate. Experts have set out stringent conditions which need to be met prior to the exceptional circumstance that a minor is considered for organ donation.