Human characteristics include aspects such as standing upright, using tools to gather food or kill animals, and evolving different body shapes. Other aspects include brains that are continually growing bigger and more complex, using symbols and language, and developing a social system.
Over the past several million years of evolution, certain unique characteristics have defined the human species. Perhaps the most significant is the ability of the species to stand and walk in an upright position. This enables the human being to hunt, move easily from place to place and defend themselves from attacks by predators.
The human body and brain evolved and changed more than any other species. The shape of the body evolved according to the regions and climates and helped the species to survive. The human brain from the earliest origins of man to the present day, has expanded and grown in complexity and ability. It has learned to adapt to changing needs and environmental factors, leading to the supremacy of the species. Key human characteristics, such as making and using tools and weapons, developing a system of communication through symbols and sounds, and developing social, political and economic systems of interaction, have contributed significantly to the survival of the species.