| This is a list of the key ideas in this lesson. Click on any one you want to explore. Once in the Net, move by clicking on any boldface word. |
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| 1 | evolution | 21 | fitness |
| 2 | genetic variation | 22 | environment |
| 3 | cell | 23 | extinction |
| 4 | population | 24 | reproductive potential |
| 5 | community | 25 | heritable traits |
| 6 | ecosystem | 26 | acquired traits |
| 7 | biological organization | 27 | gene pool |
| 8 | mutation | 28 | gene flow |
| 9 | DNA | 29 | birth |
| 10 | more fit individuals | 30 | allele |
| 11 | less fit individuals | 31 | genotype |
| 12 | natural selection | 32 | phenotype |
| 13 | competition | 33 | gene |
| 14 | selective survival | 34 | living thing |
| 15 | adaptation | 35 | traits |
| 16 | mass extinction | 36 | genetic drift |
| 17 | adaptive radiation | 37 | immigration |
| 18 | species | 38 | emigration |
| 19 | natural resources | 39 | speciation |
| 20 | heritable |
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