A. Some type of mass extinction event occurred during this time
Answer:
I believe one key event that led to the Civil War was the event at Fort Sumpter in Charleston Bay on April 12th, 1861.
Explanation:
He could've for example retreated and let communism spread which means he would not support fighting in Korea. It would've been different because you would probably have no South Korea since the North one was supported by China and without the US the south would've lost. This would probably happen if he supported an isolationist policy.
Pavlov started from the idea that there are some things that a dog does not need to learn. For example, dogs don’t learn to salivate whenever they seafood. This reflex is “hard-wired” into the dogs. The behaviorist terms, food is an unconditioned stimulus and salivation is an unconditioned response.
Hope this helped:)