The lower the fossil the older it is.
So, if two fossils were in different layers of sedimentary rock, the lowest fossil is older.
The sperm plasma then fuses with the egg's plasma membrane, the sperm head disconnects from its flagellum and the egg travels down the Fallopian tube to reach the uterus. In vitro fertilization (IVF) is a process by which egg cells are fertilized by sperm outside the womb, in vitro.
Could you please provide a picture?
