單項選擇題

下圖中,假定這些物種的共同祖先是有長尾巴(a long tail)、耳朵可煽(ear flaps)、外睪丸(external testes)、爪子固定(fixed claws),基于這種系統(tǒng)發(fā)育樹和性狀進化關系,海獅(sea lion)應擁有哪些特征?()

A.long tail,ear flaps,external testes,and fixed claws
B.short tail,no ear flaps,external testes,and fixed claws
C.short tail,no ear flaps,abdominal testes(內睪丸,在腹部),and fixed claws
D.short tail,ear flaps,abdominal testes,and fixed claws


您可能感興趣的試卷