Final answer:
The three solutions to maintain biodiversity are reintroduction of animals, nature reserves, and captive breeding. The constraints on these solutions include animals preying on domestic animals, land use for agriculture and development, and the cost of keeping animals in captivity.
Step-by-step explanation:
The three solutions to fight extinction and maintain biodiversity are:
- Some animals (such as the gray wolf) have successfully been reintroduced to parts of their historic ranges. This solution is mostly constrained by the consideration that some animals may prey on domestic animals and can be dangerous to humans.
- Nature reserves and other protected areas preserve animals' and plants' habitats. The greatest constraint on this solution is that humans use increasingly large amounts of land for agriculture, cities, roads, and mines.
- Some animals (such as the California condor) have been captured and bred by humans to prevent extinction. This solution is constrained by the consideration that keeping animals in captivity can be expensive and require large amounts of space.