The usage of 'because' and a question of prepositions

[Jesule]

Hello! How is it going?

Thanks in advance!

My questions:

1.- Is it grammatically correct to use ´because´in a question
like this?


E.X. Tell me why you follow me. Is it because I´m pretty?

If you see more mistakes, correct them please. Thanks!

2.- E.X. The virus was IN my chest and (my) throat.

a) Can I drop the second "my" in this sentence?

The virus was in my chest and throat.


b) What About the preposition "in"?.
Normally, I would use "on" with chest and "in"
with throat. Can I use "in" for both in this sentence?


Thanks in advance!

[Tdol]

1 yes, the question's fine.
2 I would drop the second 'my' and 'in' sound fine to me.