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2 days ago · Learn about the structure, function, and composition of the human body, the physical substance of the human organism. Explore the tissues, organs, systems, and biochemical constituents that make up the human anatomy and physiology.
- The Editors of Encyclopaedia Britannica
- What is the chemical composition of the human body?Chemically, the human body consists mainly of water and organic compounds—i.e., lipids, proteins, carbohydrates, and nucleic acids. The human body...
- What are the four main types of tissue in the human body?The four main types of tissue in the human body are epithelial, muscle, nerve, and connective.
- What are the nine major organ systems in the human body?The nine major organ systems in the human body are the integumentary system, the musculoskeletal system, the respiratory system, the circulatory sy...
5 days ago · Learn about the process by which human beings developed from now-extinct primates, and the fossil and genetic evidence for this history. Explore the main models and scenarios of human evolution, from the Miocene to the Pleistocene Epoch.
5 days ago · Human evolution. The hominoids are descendants of a common ancestor. Human evolution is the evolutionary process within the history of primates that led to the emergence of Homo sapiens as a distinct species of the hominid family that includes all the great apes. [1]
20 hours ago · Part of a series on Human history ↑ Prehistory (Stone Age) (Pleistocene epoch) Holocene Timelines Neolithic – Contemporary (10,000 BCE – Present) Age of the human race Recorded history (Common Era) Earliest records Protohistory Proto-writing Ancient Copper Age Bronze Age Iron Age Axial Age Classical antiquity Late antiquity Africa North America South America Oceania East Asia South Asia ...
5 days ago · Except the view, in this case, is the exquisite detail inside a bit of human brain about half the size of a grain of rice. Held in that minuscule object is a complex collective of cells, blood ...
4 days ago · New Research Exposes Early Humans' Ecological Versatility. Nov. 9, 2023 — A recent study sheds new light on the ecological adaptability of early humans at the time when they first expanded their ...
2 days ago · Soul. Artist’s depiction of a human soul leaving the body. In many religious and philosophical traditions, the soul is the non-material essence of a person, which includes one's identity, personality, and memories, an immaterial aspect or essence of a living being that is believed to be able to survive physical death.
