Each garnish should provide flavor, function, appropriate size, and which other element?

The correct answer is  - color.

Explanation:

Garnish provides many elements to the food such as flavor to taste of the food, size of the food, functions, and adds color to the presentation of the food. Height is included in the appropriate size provided by the garnish.

The texture of the food is part of the functions provided by garnish. Garnish gives the presentation of the food a beautiful appearance that helps in adding temptation for the food.