An organ represents a higher level of structure than the tissue composing it and performs functions that the tissues cannot perform alone. this is an example of the principle of:

This is an example of organizational heirarchy.

Explanation: These biological structures are designed in a way that the whole system consist of different parts serving its own unique purpose, making up a full functional system. It goes from; atoms, molecules,cells, tissues and organs which makes up a system. Digestive system for example is composed of atoms, molecules,cells, tissues and organs that helps to digest amd convert food into energy(ATP).

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a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.