True. By ruling out chance, bias and confounding, you can be able to determine that the association that is observed in the study is valid. These is because these are the main alternative explanations that can rule out that the association is causal
Answer:
It is very cold and has a taiga biosphere
Explanation:
I think it is the Spanish people that was that group
Hope I Helped : )
Well, he didn't invent the lightbulb--that was done by Thomas Edison. He did do valuable research on electricity, establishing that lightning was basically electricity.
<span>I'd say his most important contribution was serving as a member of the Continental Congress, which wrote the Declaration of Independence.</span>
