The biggest challenge is rejection. Sometimes the human body will not accept the pig organ unfortunately.
Hope this helped. Good luck !
1 possible future is The Big Crunch. This theory assumes that the average density of the universe will be enough to stop its expansion and begin contracting.
2. Some theorists state that the expansion of the universe will go on forever, and if that happens, the universe will cool as it expands, and then it will become too cool to sustain life.
3. The Big Rip. The universe may keep expanding, as I mentioned before. But as it expands, the gravity may not be able to hold all the planets together, as it is now. Galaxies would tear apart first, followed by smaller black holes, planets and stars. Eventually, space would start expanding faster than the speed of light, and atoms would start breaking down into super small particles and everything would fall into nothing.
...........The answer is A
Carbon dioxide and oxygen cannot pass through but move in and out
Non-profit organizations usually depend on grants or fund raising to cover their expenses so they must be very careful with their expenses.One consequence of this dependence can be running out of money. If they depend on fundraising and have regular fund raising campaigns then they have more independence as they rely on their own efforts to raise money rather than on government which can interfere in how they want to run their affairs.
