Check my Once the lungs are functional, there is no need for blood from the right side of the heart to flow to the left side of the heart. In other wors, there is no longer a need
for the

Imma gonna say go with the very first answer (:

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b