Because of the nitrogen cycle all of the above answers are correct
The path of an egg cell: After the egg breaks through the ovarian wall, it travels into the fallopian tube which overlies each ovary. From there, it reaches the uterus or womb. If the egg is fertilized by a sperm cell, it is implanted in the endometrium.
Adenine, Cytosine, Guanine, and Thymine.
