What's the difference between a Series 2 and 3 Apple Watch?

Related questions

1. Does Apple Watch 2 have WIFI?
2. Can you text on Apple watch without cellular?
3. Can I use Apple Watch 2 without iPhone?
4. Can I wear my Apple watch to bed?
5. Does Apple Watch 2 have walkie talkie?
6. Can I shower with my Apple Watch 1?
7. Can I answer calls on Apple Watch 2?
8. Can you make calls on Apple watch without phone?
9. Are Apple watches waterproof Series 2?
10. Why are Apple Watch Series 2 discontinued?

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