Give the true definition of an organ

Explanation:

In biology, an organ (from the Latin "organum" meaning an instrument or tool) is a collection of tissues that structurally form a functional unit specialized to perform a particular function. Your heart, kidneys, and lungs are examples of organs.

1.

a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans

2.

a large musical instrument having rows of tuned pipes sounded by compressed air, and played using one or more keyboards to produce a wide range of musical effects. The pipes are generally arranged in ranks of a particular type, each controlled by a stop, and often into larger sets linked to separate keyboards

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explanation:

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on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.