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In one study, 18-month-olds could tell the difference between intentional and unintentional actions of another person because the infants
Homo Habilis
An early human species known for its use of tools, dating back to approximately 2.1 to 2.8 million years ago.
Tools
Instruments or devices that are manually used or operated to perform a particular function, aiding in tasks or works.
Common Ancestor
The most recent individual from which all organisms in a group are directly descended.
Million Years
A unit of time used in geology, paleontology, and astronomy, equivalent to 1,000,000 years, often used to date events or processes on a geological time scale.
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