The Living Earth

4. the number of people, other living organisms, or crops that a region can support without environmental degradation.
6. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place
7. relating to, involving, or requiring an absence of free oxygen.
9. the capacity to recover quickly from difficulties; toughness
10. the impeding, slowing, or stopping effect exerted by one material thing on another.
12. a series of chemical reactions that break down glucose to produce ATP
15. the variety of life in the world or in a particular habitat or ecosystem
17. a set of things working together as parts of a mechanism or an interconnecting network.
18. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.

1. a hierarchical series of organisms each dependent on the next as a source of food.
2. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
3. the powerhouse of the cell
5. relating to, involving, or requiring free oxygen.
8. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
9. a large natural or artificial lake used as a source of water supply.
11. a compound consisting of an adenosine molecule bonded to three phosphate groups, present in all living tissue
13. a system of interlocking and interdependent food chains.
14. a biological community of interacting organisms and their physical environment
15. the total mass of organisms in a given area or volume.
16. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.