Answer:
Lack of economic rescources
Explanation:
Things such as a bad economy, lack of workers
Native American stories often depict nature as : C. Spiritual mother
Many of them believed that spirits resided in various forms of nature such as Rocks or Trees and could bring both Charm or disaster to their people
hope this helps
I think global warming I'm not sure
Answer:
The main threat to internal validity here is History.
Explanation:
Internal validity refers to how well a research is conducted. Internal validity determines if it's the independent variable (or another factor) that caused or resulted in the change in the dependent variable.
History here alludes to the internal validity threat that refers to events outside of the experimental setting (increase in cigarette taxes) that may affect the dependent variable (smoking cessation).