The CFTR gene codes for a protein that transports material across the cell membrane. A particular mutation to CFTR can cause cystic fibrosis. Cystic fibrosis is a disorder characterized by a buildup of sticky mucus in the lungs and other organs. Evaluate the best way to cure the disease. A.
Remove the gene.
B.
Develop a vaccine.
C.
Replace affected organs with non affected organs through a transplant.
D.
Change the sequence of DNA in the gene.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

your answer should be c) enjoy!

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.