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(D) The loss of biodiversity is primarily attributed to four major causes,which are collectively known as the '$Evil Quartet$'.$1$. $Habitat$ loss and

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(D) The loss of biodiversity is primarily attributed to four major causes,which are collectively known as the '$Evil Quartet$'.$1$. $Habitat$ loss and fragmentation: This is the most important cause driving animals and plants to extinction.$2$. Over-exploitation: Humans have always depended on nature for food and shelter,but when '$need$' turns to '$greed$',it leads to over-exploitation.$3$. Alien species invasions: When alien species are introduced unintentionally or deliberately,some of them turn invasive and cause the decline or extinction of indigenous species.$4$. Co-extinctions: When a species becomes extinct,the plant and animal species associated with it in an obligatory way also become extinct.

How many major causes are there for the loss of biodiversity?

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