Answer to Question 1
Answer: As a protective envelope, the formation of the ozone layer blocked most of the Sun's harmful ultraviolet radiation. Once this radiation was blocked, Earth's surface became more hospitable to life.
Answer to Question 2
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Answer to Question 3
Answer: Warm equatorial water that flows westward into and around the Gulf of Mexico then northward along the eastern coast of the United States. As it flows northward along the North American coast, the prevailing westerlies steer the warm current eastward toward Europe. It is then diverted southward toward the equator where it is picked up by the trade winds to move westward into the Gulf of Mexico and start the cycle once again