Answer:
the correct answer must be the tail.According to this question it might be the fins I guess
Answer:
European colonizers killed so many indigenous Americans that the planet cooled down, a group of researchers concluded. Following Christopher Columbus' arrival in North America in 1492, violence and disease killed 90% of the indigenous population — nearly 55 million people — according to a study published this year.
Explanation:
The correct order for these major turning points was the
tool revolution
agricultural revolution
industrial revolution
technological revolution
Each of the mentioned brought with it a very important and drastic change which then massively influenced how the world has changed after it.