[Both 1 and 2] The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropri

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The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?
1. There are no clouds or water vapour in the lower stratosphere.
2. There are no vertical winds in the lower stratosphere.
Which of the statements given above is/are correct in this context?

1 only

2 only

Both 1 and 2

Neither 1 nor 2

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