The gene for hemophilia is sex-linked. A woman who is heterozygous for hemophilia marries a man who does not carry the gene for hemophilia. Which of the following will be true? A. Half of their children of either sex may receive the gene for hemophilia.

B. Half of their daughters may be hemophiliac.

C. All of their daughters will be carriers of hemophilia.

D. All of their sons will be hemophiliac.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.