Beavers are remarkable animals. They are second only to humans in their ability to manipulate and change their environment. By building dams, beavers create wetlands, (24) _______ are one of the most biologically productive habitats on Earth. These wetlands provide a home for a wide (25) _______ of wildlife, from birds and fish to invertebrates and plants.

     The dams also slow the flow of water, reducing the risk of floods downstream. (26) _______ filter out pollutants, improving the quality of our water. Moreover, the carbon stored in the dams and surrounding wetlands helps mitigate climate change.

     Yet, despite their ecological benefits, beavers (27) _______ numerous threats. Habitat loss is a significant concern. As we continue to develop and change natural landscapes, beaver populations decline. Illegal trapping and hunting for their fur, once a thriving industry, also pose a serious risk.

     To address these issues, conservationists are taking (28) _______ . Efforts are being made to protect beaver habitats, restrict hunting, and reintroduce beavers in areas where they have disappeared. In some cases, artificial beaver dams are being created to mimic the benefits they provide.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 24 to 28.