Answer:
Everything in Earth's system such as water, land, air, and or living things.
Explanation:
All those things are called "Spheres" or specifically =
1- Hydrosphere (water)
2- Lithosphere (land)
3- Biosphere (living things)
4- atmosphere (air)
P generation (parents)
F1, F2... are offsprings
denitrification
Thiobacillus denitrificans are denitrifying bacteria
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