Protein is important for life.
Meaning: Protein is essential for living a healthy and active life.
Choice of Words: Protein is a noun referring to the nutrient that helps the body build and repair tissues. Is is a verb indicating existence or identity. Important is an adjective describing something that is significant or has great value. For is a preposition indicating purpose or reason. Life is a noun referring to the existence of an individual organism.
Alternative Expressions
Related Expressions