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【題組】58. 下列有關爬蟲類生殖的敘述,哪些正確?(多選)(A)沒有胎盤的構造,母體的養分便無法傳給胚胎(B)卵生演變成胎生的過程中,受精卵留在母體的時間逐漸縮短(C)卵生演變成胎生的過程中,受精卵
問題詳情
【題組】
58. 下列有關爬蟲類生殖的敘述,哪些正確?(多選)
(A)沒有胎盤的構造,母體的養分便無法傳給胚胎
(B)卵生演變成胎生的過程中,受精卵留在母體的時間逐漸縮短
(C)卵生演變成胎生的過程中,受精卵的卵黃量有減少的趨勢
(D)幼體一出母體立刻就能獨立生活者才算是胎生
(E)以前歸在卵胎生的爬蟲類現在應歸在胎生類
參考答案
上一篇 :
【題組】56. 下列有關杭丁頓蛋白質的敘述,哪些正確?(多選)(A)本蛋白質是抑制運動皮質發出興奮性訊號的神經傳遞物質(B)HD 患者體內同時具本蛋白質的正常型和突變型(C)本蛋白質和腦部紋狀體的神經
下一篇 :
閱讀三 動物學家原先認為爬蟲類和哺乳類的胎生並不相同,因為哺乳類有胎盤使胚胎和母體相連並獲得養分,而爬蟲類的胚胎則無特殊構造和母體相連,胚胎所需的養份全來自卵黃,因此爬蟲類的胎生被稱之
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