Choose the correct answers to complete these sentences.

To survive/rescue, the young cubs should be released into the wild when they are aged eight to ten months.
1. survive
2. rescue
Many volunteers are participating in a campaign to conserve/degrade the rainforests.
1. conserve
2. degrade
The animals looked so weak because they were kept in captivity/extinction for a long time.
1. captivity
2. extinction
Many species of animals are becoming extinct/common because of habitat loss.
1. extinct
2. common