still much left to learn about the nature

“Although research in the earth and environmental sciences has pieced together narratives of ancient and historical environmental changes, there is still much left to learn about the nature and causes of changing climatic conditions through time”.

Question:3 http://www.cracksat.net/sat/id...-errors/test401.html

Please help me in understanding the grammatical form and function of “still much left to learn about the nature”.

 

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