Digestion and Absorption

Nutrients : The chemical substances present in the food are called nutrients.

Nutrition : It is the use of nutrients by an organism for obtaining energy, building body, growth, development and providing resistance from diseases. 

Diphyodont is the condition of having two set of teeth during the life of an organism. For example : humans are diphyodont as they have two set of teeth namely temporary milk or deciduous teeth which are replaced by permanent or adult teeth.