9.4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌雄同体的,生殖系统适于体内。单起源的吸虫(单殖纲)多是鱼的外寄生虫。
10.Trochus pyramis Born is of gonophores.The male reproductive system is mainly composed of the spermaries and spermaductus, instead of mating and others glands.
摘要塔形马蹄螺为雌雄异体,其雄性生殖系统主要由巢和输管组成,没有交接器,也没有其他的附属腺体。
11.In a population in which all males and females divorce their partners, the best strategy for an individual bird is also divorce, because every bird has a high chance of remating.
12.Take the experimental rats into 8 groups including 3 groups for therapeutic dose,3 groups for toxic dose and 2 groups for lethiferous dose, with 10 rats for each group and male and female for half.