問題詳情
42.tWhich of the following statements concerning animal reproduction is correct?
(A)tAnimals reproduce exclusively by sexual reproduction.
(B)t In humans, female ovarian cycles are controlled by the blood concentration of follicle-stimulating hormone (FSH) and luteal hormone (LH).
(C)tIn humans, LH and FSH are absent in males.
(D)tIn humans, maternal blood vessels are directly connected to fetal blood vessels in the placenta.
參考答案
答案：B
統計：A:0,B:1,C:0,D:0,E:0
難度：計算中