Those are just three numbers. They have no volume.
Closed ecological systems are ecosystems that do not rely on matter with any part of an outside ecosystem. An example of closed ecosystems are aquarium ecospheres.
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Ano ang ibig mong sabihin diyan? Ito ba ay isang katanungan, o ikaw ba ay nagsasaad nito?
Answer:
the sub fields of Geography are:
1. cartography
2. hydrology
3. meteorology.
Explanation:
