they often fall or have a disturbing chase
Yes
Predatory fish and birds will kill heaps in the wild but most goldfish are killed by people who don't look after them properly.
They've not got muscles to keep them up straight. Its only the water which is holding them up and making them move.
go to the vet ASAP
to cure these problems, you should go to your local pet shop, tell them about the problem and the will give you special treatment
Goldfish are cold water fish while the others are tropical, so no they won't as depending on what type of tank you put them in, one group will die.
No. She is all ready pregnant.
Nothing. You are either pregnant or you are not pregnant - you can not be semi pregnant.
No. Once pregnant, a woman can't get pregnant-er.
If you are not pregnant then no you cannot be pregnant.
Selena is NOT pregnant.
you can get pregnant