What pets are the easiest and the hardest to take care of?

1. I honestly thought it was a cat.
Cats don't die in masses from owners' "mistakes".

2. Fish.
They die in millions every year. Most of them die in 3 weeks after sold because of owners' mistakes.

3. Insects.

4. A horse.

5. Fish.
I need to do 30~50% water change weekly on each of my four tanks.
I have to do the gardening thing in my planted aquariums, because the aquatic plants can easily overgrow and they are very fragile.

6. Once again, I thought it would be a cat. You just feed them, and they sleep all day.

7. Cat.
I've seen too many cats rarely moving from their spots.

8. Fish.
They never stop moving.

9. Dog.

10. Probably a snake.