It would be the last one.
Sickle cells can damage your spleen, the organ that helps fight germs as part of your immune system. That can make you more likely to get pneumonia and other infections.
Answer:
the cycle would stop because the plants can't take in atmospheric nitrogen
Tadpoles has gills ...and after metamorphosis frog gets lungs and an additional skin / cutaneous respiration !
so answer is A
