biology

4. an interacting group of various species in a common location
6. fuel a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing organic molecules originating in ancient photosynthesis that release energy in combustion.
8. the global ecological system which includes all life on Earth and all ecosystems capable of supporting life
9. an organism that decomposes organic material: for example, soil bacterium, fungus, or invertebrate
10. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.
13. The energy available to a herbivore that eats the plant
15. a chemical reaction, where fuel reacts with oxygen to create carbon dioxide and water vapor

1. a group of individuals of the same species living and interbreeding within a given area
2. the branch of biology that studies how organisms interact with their environment and other organisms
3. the layers of gases surrounding a planet or other celestial body
5. Each feeding level of a food chain
7. the decrease in forest areas across the world that are lost for other uses such as agricultural croplands, urbanization, or mining activities
11. the total amount of water on a planet
12. the planet on which we live; the world.
14. it consists of a community of organisms together with their physical environment