Hot soup tastes better than cold soup. Why?

Offspring formed due to sexual reproduction have better chance of survival. Why? Is this statement always true?

How are synthetic detergents better than soaps?

How are synthetic detergents better than soaps?

From evolutionary point of view allogamy is better than autogamy. Why?

Antacids are commonly used for neuralizatlization of excess of acids. Why are metal hydroxides better than sodium hydrogencarbonate? Do these treat the cause of hyperacidity.

Potentiometer is better than voltmeter for measuring emf because (i) It is cheap (ii) Easy to handle (iii) Its measurement uses null method