Can a person that sails a 200 ton yacht sail a ship?

You mean a 200 ton mega-yacht? For both, if they have the requisite Certificate of Competency to do so then yes. If not, then no.

There is a CoC for Master of 200t mega-yachts Master of Yachts 200ton (Limited) MCA approved IYT Captain / First Mate Course with Superyacht Crew Academy, which is not the same as a CoC for an ocean-going ship such as a tanker, container or cruise ship under STCW - STCW Convention - Wikipedia

Whilst STCW also describes certification for large yachts, it's not the same as for a "foreign-going" ship. Once a large yacht gets to the size or passenger carrying capacity of a mini cruise ship, you would have to go for a higher certificate.

CoC - Certificate of Competency.

What is the craziest conspiracy theory you've heard? I've heard that Barack Obama is an ancient Egyptian time traveller. I've also heard his wife is a man.

I don't care if you call it the Illuminati, the Gnomes of Zurich, the New World Order, it's all the same thing to me. The weirdest conspiracy theory of all is the idea that there is a single cabal of multiple people secretly running the whole world. That is so

Do raw eggs help in gaining weight?

The idea of eating raw eggs to help in weight gain is to add the egg(s) to your normal meal, stirring the egg into a glass of milk, a milk shake, or a bowl of hot or cold cereal to provide extra protein and calories.  Eating the egg raw is

What would happen if germs never existed?

This is too easy, if germs had never existed, then life as we know it would not exist. Life started out as germs and bacteria.