20.5: Masharti muhimu
- Page ID
- 178145
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- mali
- chombo au hali ambayo inaweza kuunganishwa ili kuongeza thamani na athari mabadiliko mazuri.
- viumbe hai
- aina ya mimea na wanyama zilizopo duniani na kuunda mazingira hai.
- ethnosphere
- jumla ya yote ya maarifa ya binadamu kwa wakati.
- maadili
- kanuni na viwango vya tabia ambayo ni kuchukuliwa muhimu.