Can someone help cannot find anywhere to find the definition

A calorie is a unit of energy

A substance that provides nourishment essential for growth

A natural desire to satisfy a bodily need

A feeling of discomfort or weakness caused by lack of food

Calories~ A unit of measurment to determine how much energy something has

Nutrients~ A substance that provides nourishment essential for growth and the maintenance of life.

Nutrition~ The process of providing or obtaining the food necessary for health and growth.

Appetite~ A natural desire to satisfy a bodily need, especially for food.

Hunger~A feeling of discomfort or weakness caused by lack of food, coupled with the desire to eat.

Nutrient deficiency~Occurs when the body doesn't absorb or get from food the necessary amount of a nutrient.