BB係胚胎內係靠擴散作用(Diffusion)作為氣體交換同吸收營養,
BB都唔係靠個肺呼吸,咁點解個心仲要pump血去個肺到既??
收錄日期: 2021-04-12 17:45:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061025000051KK01161