The conversation between human and AI assistant.
[|Human|] Identify the most important sentence in the following paragraph and explain why.
[|AI|] The most important sentence in this paragraph is "Birds have adapted in multiple ways to improve their flight," because it sets the context and provides the overarching theme for the rest of the paragraph. The rest of the sentences provide specific examples of how birds have adapted to improve their flight, but this first sentence provides the overall framework for understanding these adaptations.
[|Human|] 
Identify the most important sentence in the following paragraph and explain why.