Here are the answers to your questions:
Question 1: How would Life on Earth be affected if the atmosphere did NOT have any Greenhouse Gases/Greenhouse Effect?
Answer: d. There would likely not be life on Earth because its surface would be much colder and Earth's water would be frozen.
Question 2: How has the amount of CO2 in the atmosphere changed since the Industrial Revolution?
Answer: c. It has significantly increased.
Question 3: All of the following are greenhouse gases EXCEPT which one?
Answer: d. helium
Question 4: In which layer of the atmosphere is Ozone found?
Answer: b. stratosphere
Let me know if you need any more information or help!