Human opposable thumb
Alliteration Hyperbole Metaphor Irony. View all reading worksheets. View all writing worksheets. Dramatic Irony Cacophony Anaphora Setting.


Adductor pollicis muscle
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hand | Definition, Anatomy, Bones, Diagram, & Facts | Britannica
The human thumb is a marvel of evolution, allowing our ancestors to craft stone tools and radically expand their food choices. New research suggests our agile, dextrous thumbs appeared 2 million years ago, in a development that irrevocably changed the course of human history. Many primates have opposable thumbs, but none are quite like ours. The human thumb, set in opposition to the other fingers, allows for precision grasping, which anthropologists consider a necessary physical attribute for crafting tools. Scientists are naturally interested in knowing when this added dexterity evolved and whether it coincided with the emergence of stone tool production and other cultural innovations. The new research challenges this methodological approach and instead evaluates each hand on its own merits.



Human evolutionary genetics
Timeline: Fullscreen. The continent where human beings first appeared is Africa. Homo erectus were the first human beings to leave Africa.





Humans Homo sapiens are a species of highly intelligent primates. They are the only extant members of the subtribe Hominina and—together with chimpanzees , gorillas , and orangutans —are part of the family Hominidae the great apes , or hominids. Humans are terrestrial animals , characterized by their erect posture and bipedal locomotion ; high manual dexterity and heavy tool use compared to other animals ; open-ended and complex language use compared to other animal communications ; larger, more complex brains than other primates; and highly advanced and organized societies.
