It depends. Are you talking about humans? 8D Humans use internal fertilization but the disadvantages in external fertilization is that a small number of eggs survive.
they have external fertilization , PS i learned it in science :P zz this is all wrong...it does NOT use exernal fertilization...external fertilazation is for fish and stuf,but internal is for humans and mamals.
EXTERNAL
they use internal fertilization they use internal fertilization they use internal fertilization they use internal fertilization
Uhmm they usually use internal and external at the same time..
Salmon use external fertilization
Salmon use external fertilization
they have external fertilization , PS i learned it in science :P zz this is all wrong...it does NOT use exernal fertilization...external fertilazation is for fish and stuf,but internal is for humans and mamals.
they use external fertilization.
External, because they lay eggs.
Pythons use internal fertilization.
As a mammal moose have internal reproduction