Answer:
♡ hiya there, human! ♡
- double circulation of blood means that the blood passes through the heart two times per circuit.
hope I could help! have a great day.
-madi/madeline
✧・゚: *✧・゚:・゚✧*:・゚✧・゚: *✧・゚:・゚✧*:・゚✧
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