The question above wants to assess your ability to argue scientifically. As this skill is something very personal, I can't write this paragraph for you, but I will show you how to write one.
First of all, you should know that the Channels on Mars are evidence that there was once intelligent life on Mars, as these channels look like artificial channels created for the movement of water.
A scientific argument, in turn, refers to an opinion, based on proven scientific facts.
In this case, to write your argument you should:
Remember that despite being an opinion, a scientific argument is a formal text and must be written formally. Also, you must remember to use the words presented in the question above.
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