<Tr> <Th> Sexual reproduction </Th> </Tr> <Tr> <Td> <Ul> <Li> Evolution of sexual reproduction <Ul> <Li> Anisogamy </Li> <Li> Isogamy </Li> </Ul> </Li> <Li> Germ cell </Li> <Li> Meiosis </Li> <Li> Gametogenesis <Ul> <Li> Spermatogenesis </Li> <Li> Oogenesis </Li> </Ul> </Li> <Li> Gamete <Ul> <Li> spermatozoon </Li> <Li> ovum </Li> </Ul> </Li> <Li> Fertilization <Ul> <Li> External fertilization </Li> <Li> Internal fertilization </Li> </Ul> </Li> <Li> Sexual selection </Li> <Li> Plant reproduction </Li> <Li> Fungal reproduction </Li> <Li> Sexual reproduction in animals <Ul> <Li> Sexual intercourse </Li> <Li> Copulation </Li> <Li> Human reproduction </Li> </Ul> </Li> </Ul> </Td> </Tr> <Ul> <Li> Evolution of sexual reproduction <Ul> <Li> Anisogamy </Li> <Li> Isogamy </Li> </Ul> </Li> <Li> Germ cell </Li> <Li> Meiosis </Li> <Li> Gametogenesis <Ul> <Li> Spermatogenesis </Li> <Li> Oogenesis </Li> </Ul> </Li> <Li> Gamete <Ul> <Li> spermatozoon </Li> <Li> ovum </Li> </Ul> </Li> <Li> Fertilization <Ul> <Li> External fertilization </Li> <Li> Internal fertilization </Li> </Ul> </Li> <Li> Sexual selection </Li> <Li> Plant reproduction </Li> <Li> Fungal reproduction </Li> <Li> Sexual reproduction in animals <Ul> <Li> Sexual intercourse </Li> <Li> Copulation </Li> <Li> Human reproduction </Li> </Ul> </Li> </Ul> <Li> Evolution of sexual reproduction <Ul> <Li> Anisogamy </Li> <Li> Isogamy </Li> </Ul> </Li>

Which of the following types of fertilization is more efficient