Across
- 3. The highest order in levels of Ecology
- 4. Species that are the first into a new area
- 6. Plants
- 11. Third stage of growth where population levels off
- 13. Primary ______ eats only plants
Down
- 1. Zone that gets no sunlight
- 2. Density ______ includes living things
- 5. Carrying ______ is the ideal number of individuals in an ecosystem
- 7. Two species who both benefit from each other
- 8. Succession that starts from no soil
- 9. Very low rain and includes cacti
- 10. Study of interactions between organisms and their environment
- 12. Where freshwater meets salt water