6th Grade: Relationship between organisms

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A squirrel eats a nut from a chestnut tree. The squirrel gets food and the tree gets nothing (and isn\'t hurt either). What is this relationship called?

If one organism is hurt and the other gains, what is that called?

A flatworm lives inside of frogs and causes the frogs to develop extra legs (which hurts the frog\'s ability to hunt). What is this called?

What is it called when one organism gains and nothing happens to the other one?

When a dog hunts and eats a rabbit, what is the rabbit considered?

What is it called when two organisms fight for the same resource (food, shelter, or a mate)?

The fungi and algae are in a relationship (called lichen) in which they both gain from it. What is this called?

The name scientists give the special relationships between two organisms is...