simple-> doesnt coordinate activities unless there is a ganglia
complex -> has a true brain with sensory structure that coordinates acitivties efficiently
Organ systems are most complex and fragile starting with the atoms. The most complex organ systems is the organism. In between are the molecules, cell, tissue, organ, and organ system.
somatic is voluntary autonomic is involuntary.
Not all animals have complex nervous systems. In fact, most lower animals don't even show an organized nervous system. Its only in higher animals like chordates that a proper organized nervous system is seen.
Because of their complex organs, circularitory systems, nervous systems, and gas exchange systems.
explain the difference between systems and sub systems
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I'm no scientist but I would say that we do have a complex nervous system. Learn more at: http://en.m.wikipedia.org/wiki/Nervous_system
the difference between end user system and organisational system
no answer
Generally, mammal nervous systems are more complex and larger than reptile nervous systems due to the higher brain-to-body ratio in mammals. This complexity often translates to higher cognitive abilities and behaviors in mammals compared to reptiles.
parasympathetic and sympathetic nervous systems
The group of organ systems organized from most complex to least complex typically starts with the nervous system, then the circulatory system, followed by the respiratory, digestive, excretory, endocrine, and finally the integumentary system.