> When a spermatozoan buries into the egg a reaction is caused which prevents ot...

gpvos · on March 5, 2019

I thought that was general knowledge. It certainly was part of the sexual education I got at school.

gowld · on March 5, 2019

Sometimes, after many years, some people forget some of the irrelevant details of their education.

Do you remember all the steps in the ATP cycle?

lugg · on March 5, 2019

"Not so irrelevant now is it"

Your teacher, maybe.

denimnerd42 · on March 5, 2019

same here.. unfortunately we can't assume reproduction was a fairly covered topic at schools across the US however.