Fill in each blank with one best word.

Nowadays people are more aware that wildlife all over the world is in 31. ____________. Many species of animals are threatened, and could easily become extinct if we do not 32. ____________  an effort to protect them. There are many reasons 33. ____________  this. In some cases, animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught alive and sold as pets. For many animals and birds, the problem is that their habitat - the place where they live is disappearing. More land is used for farms, houses or industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them grow better crops, but these chemicals pollute the environment and harm wildlife. The most successful animals on earth - human 34. ____________  - will soon be the only ones left unless we can 35. ____________  this problem.

Nowadays people are more aware that wildlife all over the world is in 31. ____________.