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> When a spermatozoan buries into the egg a reaction is caused which prevents other sperm from being able to penetrate.

This is an explanation I was looking for. Thanks.

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

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?

"Not so irrelevant now is it"

Your teacher, maybe.

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