Across
- 3. surviving under certain conditions
- 5. the natural home or environment of an animal, plant, or other organism
- 8. a group of living organisms consisting of similar individuals
- 10. a hard creamy-white substance composing the main part of the tusks of an elephant, walrus, or narwhal
- 11. a period of ten years
- 13. warning that causes someone to do something
Down
- 1. seriously
- 2. to threaten with extinction
- 4. damage to something so it can’t be used again
- 6. cause (someone or something) to be vulnerable or at risk; endanger
- 7. a broad strip or area of something
- 9. catching and killing animals illegally
- 12. an official count or survey of a population