Which of the following describes an example of fertilization in higher organisms?

Fertilization is the process by which a sperm cell fuses with an egg cell to form a zygote, which is the first cell of a new individual. Among the options listed, the one that describes an example of fertilization in higher organisms is the fusion of sperm and egg nuclei. This occurs when a sperm cell, which is produced by the male, penetrates the egg cell, which is produced by the female, and their nuclei merge to form a single cell with a complete set of chromosomes. This process typically occurs in the fallopian tube of the female reproductive system. The other options listed describe other aspects of sexual reproduction, but they do not involve the actual fusion of sperm and egg nuclei that defines fertilization.