I believe it is B. An academic voice is used by declarative statements. Very straightforward and clear without using fancy/complicated words.
Answer:
A one word adjective to describe what you have stated is:
<em>maturity.</em>
Answer:
Guppies can live with other peaceful fish in aquariums but piranhas should only be kept in tanks with other piranhas because piranhas typically eat other fishes.
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