Internal.
external digestion..........
In humans there is one external and one internal jugular vein. The internal jugular vein is much larger (about twice the diameter) of the external jugular. In the cat there are a pair of each vein but the external jugular vein is about twce as large as the internal. (Opposite of humans.)
internal same like humans
It feels better
internal is traditional reproduction, like humans. where external is where the eggs are laid and sperm would be "sprayed" over them. some fish do this.
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.
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.
internal external not internal external not
Internal. Dogs mate through copulation and internal fertilisation, like all mammals (including humans).
its internal
Is a salmon internal or external?
What is internal and external sources?