Predator
A predator.
Predator is something that hunts another creature. Prey is their target.
Prey. Predator is the creature that hunts prey.
The sperm whale
A predator is an animal (or human) who hunts another animal (or human). A predator hunts prey.
a predator
In the game of Magic: The Gathering, a target creature can fight another creature on the battlefield by being chosen to deal damage to that creature.
A Predator.
Judging by the name, obviously the indestructible creature will be beaten by the creature with the deathtouch. It's because no matter how indestructible the creature is, the one with the deathtouch will always be able to beat it because deathtouch will instantly kill anything it touches.
A cannibal.
prey
Yes, lifelink works when a creature with lifelink is blocking another creature. When the creature with lifelink deals damage while blocking, its controller gains that much life.