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Question
Which is the only planet in our solar system that supports life? Explain how it is able to support life. [3 marks]
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Solution
Our planet Earth is the only planet in the solar system that supports life. (0.5 marks)
Some specific environmental conditions are responsible for the existence of life on Earth.
These include:
- Just the right distance from the Sun, so that it has the right range of surface temperature; (1 mark)
- The presence of surface water, suitable atmospheric composition, and a thick blanket of ozone to protect the surface from radiation. (1 mark)
Other planets lack one or more of the above criteria, and hence, are lifeless. (0.5 marks)
Some specific environmental conditions are responsible for the existence of life on Earth.
These include:
- Just the right distance from the Sun, so that it has the right range of surface temperature; (1 mark)
- The presence of surface water, suitable atmospheric composition, and a thick blanket of ozone to protect the surface from radiation. (1 mark)
Other planets lack one or more of the above criteria, and hence, are lifeless. (0.5 marks)
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