<u>Human activity</u>. The sixth mass extinction of of organisms caused by human actions potentially could go as far back as the late Pleistocene era (over 12,000 years ago.)
Answer:
Example of the Scientific Method
1. Observation: My toaster doesn't work.
2. Question: Is something wrong with my electrical outlet?
3. Hypothesis: If something is wrong with the outlet, my coffeemaker also won't work when plugged into it.
4. Experiment: I plug my coffeemaker into the outlet.
5. Result: My coffeemaker works!