1) Общий - Have scientists also analyzed the world's resources? 2) Альтернативный - Have scientists analyzed the world's resources or the causes of global warming? 3) Разделительный - Scientists have also analyzed the world's resources, haven't they? 4) Специальный - What have scientists analyzed? 5) Вопрос к подлежащему - Who have analyzed the world resources?
2) Альтернативный - Have scientists analyzed the world's resources or the causes of global warming?
3) Разделительный - Scientists have also analyzed the world's resources, haven't they?
4) Специальный - What have scientists analyzed?
5) Вопрос к подлежащему - Who have analyzed the world resources?