Biology Crossword

2. When an organism reproduces by making a copy of itself.
4. The maximum that an ecosystem can support.
5. When a species is introduced into an environment that it isn't native to.
7. when a population has unrestricted growth.
9. When one organism is harmed at the other's benefit.
11. When an already established ecosystem is reduced by an event, like a wildfire.
12. A plant's reaction towards sunlight.

1. The cycle that nitrogen is inter converted with the environment, this includes nitrogen fixation.
3. A species that is close to extinction.
6. When the population of post reproducing and reproducing ages are about the same.
8. What limits a population's growth, or causes it to decrease in size
10. An insecticide used in the US until 1972, when it was banned.