Plz help guys I dont understand how to this or start Can someone please explain and give examples

What are genotypes? what are phenotypes?

What is the name for a substance formed in a chemical reaction

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."