Oviposition animals refer to animals that reproduce by laying eggs, such as chickens, ducks, fish, frogs, turtles, butterflies and so on. The process in which the fertilized eggs of viviparous animals mature and produce in the uterus of female animals (such as cats, rodents, primates, etc.).
The eggs of oviparous animals develop into new individuals in vitro, and most of the nutrients needed for embryo development come from yolk. Viviparous animals get oxygen and nutrition from the mother through the placenta, and most of the nutrients needed for embryonic development come from the mother. After laying eggs, oviparous animals become animals after hatching, and the fetus is directly produced by the birth canal after developing in the mother's uterus.
Viviparous process
The fertilized eggs of viviparous animals are usually very small, fertilized at the upper end of the mother's fallopian tube, then developed into early embryos, implanted in the uterus, and then grew on the inner wall of the mother's uterus. Through the connection between the fetus and the mother, they absorb nutrients and oxygen in the mother's blood, transport carbon dioxide and waste into the mother's blood, and discharge it through the mother.
When the fetus matures, the uterus contracts to expel the larvae from the body, forming an independent new life. All mammals are viviparous, only platypus and echidna are oviparous. Nutrients needed for embryonic development can be obtained from the mother until birth.
Viviparous provides protection, nutrition and stable constant temperature development conditions for developing embryos, which can ensure the normal activities of enzymes and metabolism and minimize the adverse effects of external environmental conditions on embryo development.