Cystic fibrosis (CF) is an autosomal recessive disorder caused by faulty chloride ion channels in cells lining of the lungs and the pancreas. A man and woman, with no CF symptoms, have an unaffected boy and a daughter with CF. Use (A) for the dominant allele and (a) for the recessive allele. A child with CF has a: Group of answer choices

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

d. groundwater flows through the subsoil and deposits minerals.