People who are lactose intolerant are unable to digest lactose, the sugar commonly found in dairy, because their bodies don't make the enzyme lactase.
Lactase works by breaking down lactose into a simpler sugar that can be used by the body. Without it, lactose is not absorbed by the body & remains in the waste where gut bacteria metabolize it & cause the bloating, gas & other similar discomforts experienced by the lactose intolerant.
Hope that helps!
In truth, though, it is the non-lactose intolerant people that are the mutants. Not the other way around. Most wild animals don't consume milk after they have been weaned & it's just something humans developed to accommodate their diet.
Answer:
The oxygen atom is not balanced in the chemical reaction.
Deoxyri- Nucleic Acid (the control over genetics)
Ribo- Nucleic Acid (control over organelles functions)
The water level fell because of eccesive use of underground water and due to that the water debt increased