You're probably starving, eat food.
Just reset to default in settings.
The animals are supposed to disappear when you leave the game Minecraft. After every 64 blocks that is made an animal disappears making more room to build.
No, you can't.
You cant, but they'll eventually disappear.
after about 5 min.
you might not have tamed them. Otherwise, it might be a bug.
A pig has 10 health points, which means five hearts.
My map didn't disappear. If you want to ask this to a specific person: type a name after your question or ask it personally.
Logging on and off usually makes the items disappear.
The wither has 300 hearts however the ender dragon can regen health but only has 200 hearts.
You have 10 hearts with 2 health per heart, meaning a maximum health of 20
You hit the F1 key to made your hot bar disapear.