Kingdom Animalia
The Kingdom Animalae contains many different species of animals. Their systems are complex because they require instincts and senses in addition to body parts.
Animals are considered the most complex kingdom of organisms due to their intricate organ systems, diverse body plans, and complex behaviors that allow them to adapt to various environments. Animals have evolved specialized adaptations that enable them to perform a wide range of functions, leading to their complexity.
Most Complex Structure in the Universe is Your Brain
The most genetically complex structure in the human body is the brain.
The knee joint is likely the most complex in the body, followed by the shoulder joint.
Brain tissue
Structures and Features
The brain.
Heart
The most primitive kingdom is often considered to be the Kingdom Monera, which includes bacteria and archaea. These organisms lack a true nucleus and other membrane-bound organelles found in more complex organisms.
The levels of organization in the body from least complex to most complex are cells, tissues, organs, organ systems, and the whole organism. Cells are the most basic units of life, which combine to form tissues, then organs that work together in organ systems to support the body's overall function.
Except for the brain, humans have a body that is as complex as any other mammal's.