Nothing.
You die
if it does not rain for a long period there could be draught and plants and animals could die.
They Will die
Thats a pregnancy sign called implantation bleeding
Nothing will happen. It is just the same as if she wasn't on her period. Her finger will get very messy.
You will die after a while.
After a certain period of time, they will die naturally. Water is their natural habitat.
They were upset for a while, recovered soon.
you can not get pregnant while you have your period. you can only get pregnant when you are ovulating. ovulation happens about two weeks after your last period. if you are trying for a baby then the doctors can tell you when you are ovulating
Absolutely nothing - you can do anything during your period that you'd do at any other time of your menstrual cycle - drinking soda on your period doesn't effect anything.
They die after a short while. You can extend their life by keeping them in water and/or in the refrigerator.