offspring development outside of the body (any thing that lay eggs)
Reptiles and birds are among the major groups of vertebrates that have internal fertilization and external development. Also included are monotremes and marsupials.
Fish development can be both internal and external depending on the species. Some fish, like most bony fish, have external fertilization where eggs are fertilized outside the female's body. Others, like some species of sharks, exhibit internal fertilization where fertilization occurs inside the female's body.
I remember a really great explanation in an old biology textbook, but I no longer have it and I'm having trouble finding a good answer for you online. One big advantage is that because the offspring are carried inside the mother and not in eggs, they are mobile and the mother can protect them from predators.
The external marking between the two testes is called the scrotal raphe, which is a line of tissue that runs from the bottom of the scrotum to the perineum. It marks the fusion point of the two halves of the scrotum during fetal development.
the reproduction of frogs are external fertilization. By Crystal
External
its internal
External fertilization and development
Taiwan External Trade Development Council was created in 1970.
External, because they lay eggs.
Taiwan External Trade Development Council's motto is 'Cooperation, Commitment, Concentration, Creativity'.
internal
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external reproductive organs can be distinguished by the 12th week of development
There are many internal and external factors that affect child development. One internal factor is the genetic makeup of the child.
Reptiles and birds are among the major groups of vertebrates that have internal fertilization and external development. Also included are monotremes and marsupials.
development of an economy is an internal phenomenon as it comes from within.