The diversity of birds helps them survive by the differences in their beaks the different shapes and sizes means they all eat different food therefore that is not an issue. Different coloration is not an issue due to the species separating from each other. The diversity keeps the birds alive by signifying differences.
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Answer:
Pope Leo III's crowning of Charlemagne in 800 AD was significant because it gave papal legitimacy to Charlemagne's new role as emperor.
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Answer:
Railroads improved the movement of people from one area to the other
Observation balloons gathered information about the enemy and communicated it back to the officers
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i took the test.
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The passage of the 17th amendment changed hiw America votes for state legislation and how vacancies will be filled.
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the 17th amendment allows the voters of the state vote directly for senate instead of giving that power to the congress