List four benefits to human life by eliminating the use of CFCs.

OR

Suggest two practices giving one example of each, that help protect rare or threatened species.

By eliminating CFCs ozone hole depletion can be prevented. Reducing the ozone hole will prevent less UV rays to penetrate in the earth. Skin diseases, skin cancers can be prevented. Due to elimination of aerosols, pollution will be reduced.
OR
Rare or endangered species can be protected by either in situ conservation or by ex situ conservation.
In in situ conservation, the endangered species are protected in their natural habitats. E.g., wildlife sanctuaries, national parks.
In ex situ conservation, the endangered species are removed from their natural habitat and protected in habitats similar to their natural habitats. E.g., botanical gardens and zoological parks.