Ais a simplified representation of a real object or system.

Models are simplified representations of a real object or system.

Model

Explanation:

A representation of a real object or system in its physics, conceptual or structural form is called the model of that object or system. A model only represents an object or system but is not the object/system itself. An example of the model of a system can be a model representing the water cycle which symbolically explains the systemic process and an example of a model of an object can be a globe which is a representative of the earth.The model tries to simplify our understanding of the given object/system and hence there is a little deviation from the real object/system. The purpose of the model is usually to provide basic knowledge regarding that particular object/system by giving a simpler representation.

No that answer is wrong. you have written the function of mitochondria in chloroplast and function of chloroplast in mitochondria.

It is evolution, because we all have some of the same traits like eye color or shape or ears.