Why mule is sterile in nature?

Why is a sterile environment important in tissue culture?

Why sewage disposal into natural bodies is not advised?

Metals are ductile in nature. Why?

Why are rain drop spherical in nature?

The gravitational force is always attractive in nature. Why?

Why are aquatic animals mostly ammonotelic in nature?

Sterilization refers to the wide range of methods done to overcome microbes. Considering this statement, how the laminar air flow chamber is sterilized to carry out inoculation process in plant tissue culture technique.