Question

what evidence suggests the mastodon bones in dr. deméré’s study were broken by humans?
the bone marrow that was left untouched
the depth at which they were buried
the nearby stones with scratch marks
the carbon dating that showed their age

Explanation:

To determine the evidence that the mastodon bones were broken by humans, we analyze each option:

• "The bone marrow that was left untouched" does not indicate human - caused breakage.
• "The depth at which they were buried" is related to burial context, not bone breakage by humans.
• "The nearby stones with scratch marks" suggests that humans used these stones as tools to break the bones, as scratch marks on stones can be associated with tool - use for such tasks.
• "The carbon dating that showed their age" only gives information about the age of the bones, not how they were broken.

Answer:

the nearby stones with scratch marks