Biology Crossword

6. The study of the relationships between organisms
7. A type of realistic population growth graph that involves rapid growth before a plateau
9. Organisms need this to carry out life processes
12. The movement of organisms INto an area
13. The energy source at the root of all food chains
15. Living factors of ecosystems
16. The first organism to arrive during Succession
18. The process of turning nitrates back into nitrogen gas
20. Harmful algae blooms caused by excessive nitrates

1. The number of individuals per unit of area
2. The islands whose environment is collapsing due to the loss of otters
3. A relationship between organisms in which both benefit
4. The spatial distribution of organisms in an area
5. The number of organisms of a population that an ecosystem can support
8. The backbone of all organic compounds
10. Any factor, abiotic or biotic, that restrains the growth of a population
11. A group of organisms that belong to the same species
14. The type of curve that indicates organisms likelihood of survival
17. An organism that can make its own food
19. An organisms role in its environment