Forum:Question about trivia of "Zero Mission" page

Hello to all.

The Zero Mission page of the wiki says, in the Trivia section: "Metroid Zero Mission actually answered some unseen questions in the series, such as why does the Varia Suit gain such massive shoulders and did the arm cannon always opened a hatch to fire missiles".

I have not played the game, so could you please answer explicitly these questions for me?

Thanks, Giorgio