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Table 6.1 Some physical and chemical factors important for defining whether an environment is habitable and the ranges tolerated by microorganisms and humans.

Parameter

Microorganisms

Humans[a]

Temperature

< 0-l2l°C

0-30°C

Pressure

<50 hPa->l0 000 hPa[bl

700 hPa-5 000 hPa

Radiation

4 000 Gy[c

1-3 Gy[c

pH

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