百科知识大汇集,关注《发现号》,提出你的问题吧!为什么牵牛花到中午就凋谢了?清晨四五点钟,牵牛花早早地开花了,但是到了中午,美丽的牵牛花就会凋谢。这是因为牵牛花又大又薄,花瓣里有很多水分,中午太阳一晒,水分被蒸干了,花儿就凋谢了。鲸鱼为什么会喷水?鲸鱼生活在水里,但它需要浮上水面呼吸空气。在换气的时候,它要先把装在肺里的大量废气从鼻孔排出去, Encyclopedic knowledge pool, pay attention to “Discovery”, put forward your question! Why morning glory fade to noon? Four or five o’clock in the morning, early morning flowering of morning glory, but at noon, the beautiful morning glory Will fade. This is because the morning glory is large and thin, there is a lot of water in the petals, a sun at noon, the water is evaporated, the flowers fade. Why do whales spray water? Whales live in water, but it needs to float to the surface to breathe the air. When ventilation, it must first discharge a large amount of exhaust gas installed in the lungs from the nose,