What is the advantage of having different shaped beaks? To look different from other species. To be able to eat different types of food. To fly faster. Ect.
Once you make the hypothesis, you need to check if it's true. So your answer would be C!
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The answer is reptiles
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If decomposers suddenly disappear from an ecosystem, then major cycle like nitrogen and carbon cycle will stop and no recycling of nutrients will occur.
