Question

Extinctions unravel ecosystems because of

• A. Habitat loss
• B. Over-exploitation
• C. Alien species invasion
• D. Co-extinction

Answer 1

The correct option is D Co-extinction

Habitat loss, over-exploitation and alien species invasion cause extinctions. Extinctions in turn, cause more extinctions, causing ecosystems to unravel. Habitat loss, over-exploitation and alien species invasion are the causes for extinctions and not vice versa. In other words, extinctions do not cause habitat loss, over-exploitation or alien species invasion. However extinctions cause more extinctions, eventually leading to the breakdown of ecosystems.