Hi **** Chun, First, let me fix the grammar/structure a little bit: It is deforestation that ruins the whole ecosystem. (Yes, this is a good cleft sentence) This is the reason why more and more wild animals encounter the edge of extinction . (I would call this a noun complement, not an adjective clause) The reforestation that continues to be implemented provides a dense forest which all wild animals can inhabit without any threat.
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