Tertiary
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Explanation:
Rome was able to gain its empire in large part by extending some form of citizenship to many of the people it conquered. Military expansion drove economic development, bringing enslaved people and loot back to Rome, which in turn transformed the city of Rome and Roman culture
Answer:
Other living organisms.
Explanation:
When plankton and algae overgrow, they choke out living organisms such as fish, coral, etc,
