Đồng hồ sinh học thực ra là gì?
Tất cả các sinh vật sống đều có các chu kỳ hoạt động hằng ngày được biết đến dưới tên gọi "nhịp điệu thường nhật". Các nhịp điệu này được điều khiển bởi một hệ thống kiểm giờ bên trong hay còn gọi là đồng hồ sinh học.
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