The allele (gene) for hemophilia is recessive and sex - linked. A hemophiliac male mRRIES A NORMAL ( NON - HEMOPHILLIAc) woman whose father was a hemophiliac. Predict what kind of children they would have and in what proportions (separate the sons from the daughters).

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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: