Fishes and most amphibians (frogs, toads, etc.)
dog
They Have Internal Fertilization
external fertilization is external
Mostly water animals do external fertilization
external fertilization
External fertilization and development
Clams utilize external fertilization.
Salmon use external fertilization
they use external fertilization.
Salmon use external fertilization
The answer is this website SUCKS!
I'm no expert, but I'm fairly sure that the environmental conditions (ie. air temp) makes quite a big difference