What is the advantage of national park over zoos.
answer should be related to breeding and development.

National Parks and zoos are those areas where no human activity is allowed at all. The purpose of national parks and zoos is to preserve the animals and plants. However,in national parks the animals and plants are protected in the natural habitat where in zoos, the animals are protected in enclosures.  In national parks, the animals can move and interbreed freely. This results in the development of variation that in turn helps them to survive better in the environment. Also they feed on natural food items that makes them healthy and better developed.