Люди живут на нашей планете в течение многих лет. Мы покинули ( возможно слово напечатано с ошибкой. по смыслу больше подходит жили lived) и живем на разных континентах в разных странах. Люди на планете зависят от солнца, животных и растений. ( два раза в предложении слово animals. кто составлял эти предложения?)
I absolutely understand you, cuz I'm teenager too. Your parents aren't right I think, but they wish all the good things for you, so take care, worry about you. In my opinion, you should tell them about things, which makes you angry. Often talk with them about everything, cuz it helps to understand each other.
I think, that before it was worse, than now, because people were working from dusk till dawn. And now we have a rest very much. We have a computer games and TVs. In modern times appear new technologies and medications. But it was not always, all of this was not ten years ago. Everybody was living differently.
как-то так))