What impact do parliamentary elections have on the selection of the prime minister?

Within the political party, the candidate that best represents the ideals of each party is elected, which makes this election an important act is that the parliament will select through these elections the candidate who represents the political party before the country.

I hope you won't be solid on this answer, But I researched it with my colleagues, and we all agreed it's the amount of atoms in the compound. (I hope this was you question.)