[Campbell Biology P.751] Based on the text, which of the following statements about mollusc ... | Practice Question

Based on the text, which of the following statements about mollusc extinction and conservation is true?

  • A: The primary threats to molluscs are limited to habitat loss and pollution.
  • B: Shells of pearl mussels were historically harvested primarily for their pearls, not for other uses.
  • C: Molluscs are notable for having the largest number of documented extinctions among animal groups, with human actions like overharvesting being a significant cause.
  • D: Pacific island land snails are generally less vulnerable to extinction compared to pearl mussels.

Explanation

The text explicitly states: 'Among the many taxa under threat, molluscs have the dubious distinction of being the animal group with the largest number of documented extinctions Figure 33.21 .' It also highlights human actions, including overharvesting, as significant causes for mollusc extinctions, citing pearl mussels as an example.