You are presented with the question "what enters the egg?" and the following answer choices: 
- DNA
 - flow of electrons
 - insects
 - Chemical energy
 - fallopian tube
 - sperm nuclei
 - acid
 - pollen

Now knowing that fertilization occurs when sperm swim to an egg inside an archegonium and sperm nuclei are released into the archegonium, choose the best answer.


 

      sperm nuclei   