Ancient humans in eastern North America hunted mammoths until the mammoth disappeared from the area around 13,000 years ago. █████████ █ ██████ ████ ████ ██ █████████ ████ ███████ █ ███████ ███ █████ ██ ██ ███████ ██████████ ██ ███████ █████ ████████ ████ █████ ████ ███ ██████████ ███ ████████ ██ █ ████ ████ ████████ █████ ██ ████ █████
The author concludes that a certain ancient settlement in eastern North America was occupied by humans at a time when mammoths lived in the area of the settlement.
What makes the author think this?
Because a fossil bone with an engraving that depicts a mammoth was found in the ancient settlement.
The author assumes that the fossil bone engraving that depicts a mammoth was made by humans at the settlement when mammoths were still in existence.
The author also assumes that the fossil bone was not brought to the ancient settlement from a different location.
The argument requires the assumption ████
the engraving was ████ ██████ ███ ████ ████ ███ ██████████ ███ ████████
the fossil on █████ ███ █████████ ███ ████ ███ ███ █ ███████ ████
when mammoths disappeared ████ ███████ █████ ████████ █████ ████ ██ ████████ ████ ████████ ██ █████ ███████
the engraving technique ████████ ██ ███ ██████ ███ ██████ ██ ███████ █████ ███████
there is no ██████████ ███ ██ ██████ ████ ███ █████████ ██ ███ ███████ ███ ████