Question

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Answer 1

Hello!

1) C) Both observation 1 and observation 2

2) Planet Y is closer to earth because sun exert greater gravitational force than planet Z.

I hope it helps!

Answer 2

1 - both can be proved by the heliocentric model since it is the currently most accepted theory.

2 - since planet y has a lower planet duration year, it means it is closer and the sun exerts a higher gravitational attraction making it spin faster therefore completing the year (equivalent to one spin around the sun) in less time.


Hope it helped,

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