Woolly mammoths became extinct thousands of years ago, while other species of mammals that existed at that time still exist today. The woolly mammoths became extinct, unlike the other species, because the woolly mammoths * 1 point
produced offspring that all had identical inheritable characteristics
faced a struggle for survival
learned to migrate to new environments
had certain inheritable traits that enabled them to survive

faced a struggle for survival

Explanation:

The woolly mammoths became extinct, unlike the other species, because the woolly mammoths faced a struggle for survival due to changing of environmental conditions. Global warming is the main cause of extinction of woolly mammoth which destroy their habitats about 10,500 years ago. The environmental conditions are not favourable for them so they faced struggle for survival which causes extinction of woolly mammoth.