Fact 1: Fertilization occurs when sperm swim to an egg inside an archegonium.

Fact 2: Sperm nuclei are released into the archegonium.

Given the two facts above, answer the question "what enters the egg?" with the following options: 
- DNA
 - flow of electrons
 - insects
 - Chemical energy
 - fallopian tube
 - sperm nuclei
 - acid
 - pollen


 

      sperm nuclei   