Answer:
There is no guarantee that a human's body will accept the heart even if scientists try to build it.
Explanation:
The heart is a muscular organ that pumps blood through arteries and veins. Human hearts are different from any other creature's hearts. There is the absence of a source for cells and tissues. It is very difficult for scientists to build a heart. There is no guarantee that a human's body will accept the heart even if scientists try to build it.
answer, the heart is made up of many different types of cells
explanation, i answered what the other guy said and got it wrong
