- Thebarrierfunctionofintestinaltractalwaysdescentsatdifferentlevelafterburned,includingmechanicalbarrier,biologicbarrierandimmunologicbarrier.Researchershavelongassumedthatdeep-divingwhalesconservetheiroxygensupplybymovingslowly,notmorethan2metrespers...
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