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Why Do Some Organs Come In Pairs?
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Why Do Some Organs Come In Pairs?

Key Facts In This Video

  1. The acoel was the first bilateral organism 550 million years ago. 00:37

  2. Scientists speculate a bilateral body can move more easily because the appendages are mirrored. 00:59

  3. Amphibian bilateral hearts form as two bilaterally symmetrical buds that merge into one. 03:03

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