This is often done through Pre implantation genetic diagnosis (PGD) where an egg is fertilised but before it is implanted into the mother it is tested for specific diseases.
Answer:
Presence of acidic oxides and other chemicals in air can change the PH value of the Rain.
Explanation:
Generally, PH value of rain remains 5.0. But when the air composition changes due to sulfur dioxide or nitrogen oxides released from automobiles and coal based power plants, the combination of these with rain water makes rainy water more acidic. This results in change of PH value of Rain.
Thermophiles (Archeans which live in extremely hot temperatures)
The combination of high winds and flood waters