I would say B because c and d would decrease competition and a would do the same, or just kill the ecosystem.
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Answer:
The answer I believe is B. Erosion
Explanation:
Just sounds better than all the other choices.
Answer:
2Fe + 6HC2H3O2 → 2Fe(C2H3O2)3 + 3H2
Explanation:
There you go
True, oxygen gas ignites a glowing splint
Because they are not on the periodic tsble they are on the back and they goes together