Answer:
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
Hierarchies are important to inform evolutionary biologists on the way living systems are organised throughout history and theorise how extinct animals function based on their positions on the hierarchy. Hierarchy is also a property of gene-regulatory networks that play a central role in the development of organisms.
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