| living organism | 20 |
| human being | 6 |
| different organism | 5 |
| multicellular organism | 2 |
| soil organism | 2 |
| individual organism | 1 |
| single organism | 1 |
| cell | 193 |
| environment | 44 |
| interact with their env… | 0.77 |
| interact with each other | 0.74 |
| use oxygen | 0.72 |
| share common ancestor | 0.68 |
| live on earth | 0.68 |
| adapt to their environm… | 0.67 |
| survive | 0.66 |
| use nutrient | 0.65 |
| become extinct | 0.64 |
| respond to stimulus | 0.64 |
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| infection | 0.55 |
| salmonella | 0.49 |
| meningitis | 0.48 |
| typhoid | 0.47 |
| septicemia | 0.38 |
| osteomyelitis | 0.38 |
| inflammation | 0.36 |
| sepsis | 0.33 |
| cholera | 0.33 |
| nosocomial infections | 0.32 |
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| water | 0.68 |
| food | 0.66 |
| energy | 0.60 |
| air | 0.58 |
| microscope | 0.49 |
| way | 0.44 |
| space | 0.41 |
| other or additional ant… | 0.38 |
| each other | 0.32 |
| moisture | 0.32 |
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| unique | 0.66 |
| complex | 0.61 |
| classified | 0.60 |
| multicellular | 0.59 |
| small | 0.59 |
| unicellular | 0.59 |
| absent | 0.58 |
| conscious | 0.58 |
| active | 0.58 |
| cultured | 0.58 |
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| any number of health pr… | 0.35 |
| nodule | 0.30 |
| chronic gastritis | 0.16 |
| system | 0.56 |
| living thing | 0.42 |
| open systems | 0.35 |
| open, dynamic system | 0.28 |
| obtained by mutagenesis | 0.70 |
| composed of cell | 0.70 |
| related | 0.70 |
| adapted to their enviro… | 0.67 |
| composed of one or more… | 0.65 |
| created | 0.64 |
| modified | 0.63 |
| isolated | 0.61 |
| tested | 0.61 |
| related by common ances… | 0.61 |
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| each other | 0.66 |
| hendra virus | 0.23 |
| biological control | 0.35 |