Which of the following statements regarding the earth's axis are true?
1. It makes an angle of 23.5o with the plane of ecliptic
2. It maintains a flexible orientation with respect to the stars
3. It is the most important fact connected with Earth-Sun relationship
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Answer: Option C
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