Environmental science

2. most abundant gas in the atmosphere
4. This demographic transition is marked by a steep population increase
6. A wetland habitat that has woody plants
11. This type of growth is unsustainable for long periods of time
13. when talking about evolution, it means how well you can survive and reproduce
14. An area defined by its climate and biological life
16. Fungi, bacteria and flies are examples of this
18. your permanent mark that you leave on the earth when you die
20. The study of human populations
21. This element is cycled through plants and animals and the atmosphere
22. The amount of people added to your country NOT by immigration

1. These countries tend to have higher birth rates
3. A group of organisms in the same ecosystem that eat similar things
5. Land suitable for farming
7. A third level consumer
8. This is how clouds form and how your hot breath makes cold windows or mirrors foggy
9. A large flat cold treeless biome
10. This is the amount of a species that an ecosystem can support
12. How many different living things there are
15. the amount of energy that is transferred up each trophic level
17. The organisms that are responsible for getting energy into an ecosystem
19. A place where fresh and saltwater meet