Answer:
the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behaviour, origin, and distribution.
We all know that 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.
B. Clade 1 is ancestral to all the other clades
Although now it causes more harm than good because it doesn't really have a purpose, it is believed it once was used for humans to digest bone.