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Há 4 dias · The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period.
Há 1 hora · Human history. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers. They migrated out of Africa during the Last Glacial Period (Ice Age) and had populated most of the Earth by the time the Ice Age ended 12,000 years ago. Soon afterward, the Agricultural Revolution began in the fertile river valleys ...
Há 2 dias · In humans, the heart is approximately the size of a closed fist and is located between the lungs, in the middle compartment of the chest, called the mediastinum. In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria and lower left and right ventricles.
- kardía (καρδία)
- Circulatory
- cor
Há 5 dias · The human body is the physical substance of the human organism. Characteristic of the vertebrate form, the human body has an internal skeleton with a backbone, and, as with the mammalian form, it has hair and mammary glands. Learn more about the composition, form, and physical adaptations of the human body.
- 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...
Há 4 dias · Humans can slow and, perhaps, reverse the ecological harms that they have caused, but Earth will never return to some past pristine state.
Há 5 dias · human skeleton, the internal skeleton that serves as a framework for the body. This framework consists of many individual bones and cartilages . There also are bands of fibrous connective tissue —the ligaments and the tendons —in intimate relationship with the parts of the skeleton.
Há 5 dias · Whatever their theoretical justification, human rights refer to a wide continuum of values or capabilities thought to enhance human agency or protect human interests and declared to be universal in character, in some sense equally claimed for all human beings, present and future.
