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Commensalism.
Relationship where one benefits from another but it doesn't cause any harm or give it any benefit. Like barnacles when they catch a ride on top of a whale.

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Mutualism.
Relationship when two things help each other like the acacia tree and the acacia ant and clown fish and anemones.

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Parasitism.
It is a relationship when one benefits from another and causes harm to the host. For example, fleas and intestine worms.

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Pray and Predator.
The relationship of being eaten or eating something else. A pray is eaten and a predator is eating the pray. If a species that is pray has more, then the predator will have more food and make more babies. If a pray reduces, then the predator will also because it has no food.