Ah, my son asked same thing for his project! I told him: our four-chamber heart keeps oxygen-rich blood separate, so we have energy for long rides up these hills. Frog's three chambers mixes blood a little—enough for their life near water. But I think... sometimes simple heart is stronger. My old Bullet has just one cylinder, but it carries medicine for village elders better than any fancy city bike.
#appearance#cosmetic-surgery
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