問題：It is one of the three essential plant nutrient.<br /><br />Elementary substance has some allotrope; white one, red one, yellow one and black one.<br /><br />In some island in Pacific Ocean, accumulated stool of birds became resources of fertilizer. It was called "guano". But now, it's depleted.<br /> 出題元【Elements】

出題元【Elements】

問題

It is one of the three essential plant nutrient.<br /><br />Elementary substance has some allotrope; white one, red one, yellow one and black one.<br /><br />In some island in Pacific Ocean, accumulated stool of birds became resources of fertilizer. It was called "guano". But now, it's depleted.<br />

Ｑ：It is one of the three essential plant nutrient.<br /><br />Elementary substance has some allotrope; white one, red one, yellow one and black one.<br /><br />In some island in Pacific Ocean, accumulated stool of birds became resources of fertilizer. It was called "guano". But now, it's depleted.<br />

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