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They've been specialized so they best help that organism survive, and is affected by conditions like environment, climate, food, etc. For example, one fish may have particularly shaped fins because it needs it to survive in the strong currents where it lives, but another fish may not need such fins because it lives in shallows. Things like that have affected the appearance of things like fins, beaks, and tails.
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Visible structures like beaks as seen in Darwin finches look different among organisms due to the need for each organism to develop structures to make them adapt to their environment for survival.

Different organisms develop visible structures that are unique to their species and quite different from each other.

This visible structures are structural adaptations each organism species develop in other to survive and fit into their environment.

  • An good example of visible structures being different in organisms is beak shape and size of the finches Darwin studied.

Each species of Darwin finches had unique beak size and shape which they developed to enable them feed and survive in their different environment where they were found.

Hence, we can conclude that visible structures like beaks as seen in Darwin finches look different among organisms due to the need for each organism to develop structures to make them adapt to their environment for survival.

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