Why is cancer sign a crab?

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1. #which
2. #hercules
3. #during
4. #those
5. #astrology
6. #between
7. #represents
8. #giant
9. #fourth
10. #penance
11. #constellation
12. #cancer
13. #labors
14. #zodiac
15. #performed
16. #killing
17. #attacked
18. #second
19. #mythology
20. #family
21. #science