Ovipary, Vivipary and Ovovivipary

Ovipary,vivipary and ovovivipary

in ovipary the embryo develops inside the egg and eggs are laid before development of embryo. in other words the development of embryo occurs outside the body of female but inside the egg .after completion of embryonic development young ones hatch out of the egg.

Vivipary: the embryo develops inside body of female in her uterus. in the body of female the embryo is nourished through placenta .it occurs in eutherian and metatherian  mammals.

ovovivipary: egg is fertilized inside the body of female but it is not laid but returned within the reproductive tract of female until embryogenesis is complete. female gives birth to young one but young one develops in the egg within body of female and during development it is not nourished through placenta but it consumes food stored in the egg. examples sharks Rattle snake.