Various species are either extinct or threatened in the United States, including certain freshwater mussels, flowering plants, and mammals. Which of the following represents the correct ranking (from most endangered to least endangered) of these groups of organisms?

Question

Quizplus · Accepted Answer

Freshwater mussels are the most endangered group due to habitat degradation and water pollution. Flowering plants are also threatened by habitat loss and invasive species, but their range and distribution are more widespread than freshwater mussels. Mammals have some endangered species, but they have more protection and conservation efforts than the other two groups, making them the least endangered of the three.

Various Species Are Either Extinct or Threatened in the United