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Scientists have also analyzed the world's resources.

1) Общий - Have scientists also analyzed the worlds resources
2) Альтернативный - Have scientists analyzed the worlds resources or the causes of global warming
3) Разделительный - Scientists have also analyzed the worlds resources, havent they
4) Специальный - What have scientists analyzed
5) Вопрос к подлежащему - Who have analyzed the world resources