Biology, 17.02.2020 21:32, seth82

Heartbeat, digestion, respiration, and elimination of wastes are carried out by organ systems close to the central axis. These functions, close to the center of the body, operate or are ready to operate when the child is born. What principle of development does this represent?

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Heartbeat, digestion, respiration, and elimination of wastes are carried out by organ systems close...