3 read the following sentences from the text. his layer has the air we breathe and the clouds in the sky...the air here is 78% nitrogen and 21% oxygen. the last 1% is made of argon, water vapor, and carbon dioxide. when you feel the wind on your face, see clouds in the sky, and watch a bird flap its wings in flight, youre experiencing the troposphere.\ what conclusion can you draw from this evidence? a the gases in the troposphere are part of what humans breathe. b nitrogen is dangerous for humans because it is a toxic gas in the troposphere. c it is always windy in the troposphere because there are many clouds. d the most common gases in the troposphere are oxygen and water vapor. 4 what might happen if the earth did not have the gases found in the troposphere? a life on earth would be different for humans and animals. b more birds would be born because there would be more space. c there would be more clouds in the sky so the sun would not shine. d there would be more plants and animals on the earth.

Question

3 read the following sentences from the text. 	his layer has the air we breathe and the clouds in the sky...the air here is 78% nitrogen and 21% oxygen. the last 1% is made of argon, water vapor, and carbon dioxide. when you feel the wind on your face, see clouds in the sky, and watch a bird flap its wings in flight, youre experiencing the troposphere.\ what conclusion can you draw from this evidence? a the gases in the troposphere are part of what humans breathe. b nitrogen is dangerous for humans because it is a toxic gas in the troposphere. c it is always windy in the troposphere because there are many clouds. d the most common gases in the troposphere are oxygen and water vapor. 4 what might happen if the earth did not have the gases found in the troposphere? a life on earth would be different for humans and animals. b more birds would be born because there would be more space. c there would be more clouds in the sky so the sun would not shine. d there would be more plants and animals on the earth.

Accepted Answer

### Question 3
# Brief Explanations:
- Option A: The text says the troposphere has the air we breathe, and gives gas percentages (78% nitrogen, 21% oxygen, 1% others). So the gases here are part of what we breathe. This matches.
- Option B: Nitrogen is not toxic for humans (we breathe air with 78% nitrogen). So B is wrong.
- Option C: The text says you "feel the wind" sometimes, not that it's always windy. Also, no link between clouds and constant wind is given. So C is wrong.
- Option D: The text says 78% nitrogen, 21% oxygen, 1% others (including water vapor). So nitrogen and oxygen are more common than water vapor. D is wrong.
# Answer: A. The gases in the troposphere are part of what humans breathe.

### Question 4
# Brief Explanations:
- Option A: The troposphere has air (gases) we need (like oxygen for breathing, nitrogen in air, etc.). Without these gases, life (for humans and animals) would be different (e.g., no oxygen to breathe). This makes sense.
- Option B: Without troposphere gases, life would be hard, not more birds. So B is wrong.
- Option C: Clouds need water vapor (a troposphere gas). Without troposphere gases, there'd be less or no clouds, not more. So C is wrong.
- Option D: Plants and animals need troposphere gases (e.g., oxygen, carbon dioxide for plants). Without them, there'd be fewer, not more. So D is wrong.
# Answer: A. Life on Earth would be different for humans and animals.

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