(4) With the exception of hoses used to extinguish fires, any hose connected to. a fire hydrant must be equipped with either an approved backflow prevention. device or an approved four (4) inch air gap, unless in the Department's opinion, the application does not pose a backflow hazard, such as watering a community.
What was most likely the cause of Marie Curie's leukemia? a. Radiation c. Pollution b. Smoking d. Genetics. a. Radiation was most likely the cause of Marie Curie's leukemia.
The exact cause of most childhood leukemias is not known. Most children with leukemia do not have any known risk factors. Still, scientists have learned how certain changes in the DNA inside normal bone marrow cells can cause them to become leukemia cells. Normal human cells grow and function based mainly on the information in each cellâs DNA.