The X symbol looks too much like the multiplication symbol, it also makes using it as a variable more confusing.
A question is something someone asks. A hypothesis is like a person's theory.
An endocrine disruptor is an exogenous substance or mixture that alters the function of the endocrine system and consequently causes adverse health effects in an organism. Lipophilic chemicals are those that do not dissolve in water and have the ability to dissolve in non -polar substances and they have been linked to cause numerous diseases in humans.
