Across
- 3. What is it called when two or more organisms work together?
- 4. What is a arid land with usually sparse vegetation?
- 6. What is a area in which the vegetation is dominated by continuous cover of grasses?
- 7. What is the northernmost region of earth?
- 9. What is it called when both organisms benefit?
- 11. What is it called when two organisms fight for something?
- 12. What is it called when one organism benefits and the other is harmed?
Down
- 1. What is located at very high elevations atop mountains, where overnight temperature fall below freezing?
- 2. What is it called when one organism benefits and the other is unharmed?
- 5. What is an area classified according to the species that live in that location?
- 8. What is an area of tall, mostly evergreen trees that receives a high amount of rainfall?
- 10. What is a huge body of saltwater that covers about 71 percent of Earth's surface?