Well, probably because that's Equestria political system. Monaco is governed by a prince and has no king or queen.
Probably, as physics law seem to work almost the same way. Plus, the moon seems to be round. Anyway, there are ways to determine whether a planet is round or not.
If a planet is round then:
- When you're on the ground and you see a boat disappear on the horizon you should see the bottom disappear before the top.
- When you're on a flat area, the higher you are, the further the horizon is.
Since Twilight's alicoronation we know that Cutie marks can disappear and be changed. So I'd say, yes, the pony's cutie mark could change but such pony would rather forget this new idea to focus on their special talent as "the cutie mark says" , as most ponies seem to believe that their cutie mark determine themselves.
I think wood isn't food for normal parasprite and enchanted parasprites do not eat trees because it's still living matter. So parasprite don't have much food in the Everfree forest, the reason why they can eat so much at once and divide that easliy. To keep the spiece alive they need to be able to deal with little food and divide with little energy.
Actually, this is magic. The best proof we have is that when a ponies lose their inner magic ( Tirek) their Cutie Marks disappear. A Cutie Mark appears on a pony when they discover who they are ; my theory is that at this moment, their magic takes a relevant picture from the pony's brain and tatoos it on their flanks
Um , probably not. They might look like cristal but they aren't ^^
Sunshine and Rainbows
I guess their are living beings. Plus magic.
Pinkie Pie probably has the answer.
Playing golf and hoofball with AJ's parents I think.
If humans could clear the sky and choose the weather, don't worry, they'd do it too.
The pony of shadows.
Because they're scary. And because we haven't been underseas yet.