Question 13 1 pts 13. each year there are close to billion trees planted in the united states o six o five o two o one question 14 1 pts 14. the reason certain types of trees dominate a region is because of a natural process called wildlife o succession o overstory o deciduous question 15 1 pts 15. an area where all living and nonliving features depend on each other is called an o preservation o industry o axygen system o ecosystem

The primarily goals of the zapatistas of mexico in 1994 were land reform and redistribution. it is also included in their demands to have a greater political and cultural autonomy for the indigenous people of chiapas and the rest of mexico.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.