Reproduction in animals All the living organisms on this earth reproduce to give out their egg wants to maintain the balance in the ecosystem. The reproduction helps to maintain their population. For example, the cow gives rise to its egg wants called cow-cow. In the same manner, the hen lays eggs and give out the chickens. In this manner, all the living organisms, including microorganisms, reproduce to maintain their population on this earth. Modes of reproduction. There are two modes of reproduction. They are asexual reproduction and sexual reproduction. Asexual reproduction involves no gametes. The gametes are not formed and there is no fusion of gametes even. But in sexual reproduction, the gametes are formed and these gametes fuse to form the zygote. The zygote further develops into the new organism. The best modes of asexual reproduction are binary fish, biting, regeneration, etc. And the sexual reproduction occurs in the mode of viviparas and wovy pairs. Binary fish, a single organism divides into two organisms that is called as binary fish. The best example for binary fish is bacteria. Butting. In budding, the organism give out a bud which further develops into the new organism and it is separated from the parent organism and develops into an independent individual. The best example for budding is hydra. The best example for regeneration is the capability of generating or developing into new organism which is a piece which is separated from the parent organism. The best example for regeneration is planaria. When the planaria is cut into several pieces each and every piece develops into a new planaria. So the best example for regeneration is planaria. On the basis of the organisms on the basis of the sexual reproduction, how they produce their anguines, the organisms are divided into two types, wovy pairs and viviparas. The organisms which lay eggs and then give out the anguines are known as wovy pairs. The organisms which directly give birth to anguines are known as viviparas. The examples for wovy pairs are the lower order organisms and also the birds which lay eggs and then the chickens or anguines come out of the eggs. The viviparas organisms are those which give out the anguines. The best example for viviparas organisms are mammals. The mammals give out the directly give birth to anguines and feed them with their milk. So they are known as mammals. The best example for viviparas are mammals. In mammals there are two types of organ systems to undertake the process of reproduction. For example in human being there is male reproductive organ system and female reproductive organ system. The male reproductive system produces sperms whereas the female reproductive system produces the eggs. The sperms fuse with the eggs to form zygore. This is called as fertilization. The zygore develops into embryo and further it develops into the anguines. On the basis of the location of fertilization the organisms are again divided into two types, external fertilization and internal fertilization. If the fertilization occurs inside the body it is known as internal fertilization whereas if the fertilization occurs out of the body that is known as external fertilization. Mekamophosis. This is another interesting fact that some of the lawyer order organisms exhibit. The law which is totally different with their parental organisms. They further develop into the totally changed into their original structure. That is known as metamophosis. It is clearly exhibited by the frog. The larva of the frog which is known as tadpole larva it resembles the fish and it acts like a fish but in further process it develops into the frog. This is known as metamophosis. So whatever the facts the reproduction is the main process which is performed by the organisms, living organisms to maintain their population on the earth and also to maintain the balance in ecosystem, to maintain the biodiversity on the earth. Thank you.