The ability to switch between sexual and vegetative means of propagation provides the potential for such species to rapidly colonize areas that have been disturbed. CC BY-SA 4.0 .) This page titled 43.2A: External and Internal Fertilization is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Boundless. 24.2. Fertilization Concepts of Biology 1st Canadian Edition As we have learnt earlier that in Viviparous Animals the baby develops inside the mother's body or uterus. Some internally fertilized marine species can brood offspring until they emerge as fully developed juveniles (direct developers), strategy that can confer certain security and protection against OA to the embryos (Ellis et al., 2017; DAO and Podolsky, 2012) (Fig. The trigger for egg and sperm release (spawning) causes the egg and sperm to be placed in a small area, enhancing the possibility of fertilization. External fertilization is characterized by the release of both sperm and eggs into an external environment; sperm will fertilize the egg outside of the organism, as seen in spawning. It takes some time to get the baby fully grown and ready to be delivered out of the mother's body. Female cowries cover the egg mass until the larvae hatch. There are three ways that offspring are produced following internal fertilization: oviparity, ovoviparity, and viviparity. Difference Between Viviparous, Oviparous and Ovoviviparous Direct-developing gastropods, for example, that have no pelagic larval stage, may disperse as adults by crawling across the seabedat a snails paceor by episodic transport of adults or juveniles displaced by means storm surge or exceptional tidal currents. 4). Section 6 Flashcards | Quizlet The advantage of being ovoviviparous is that the egg is protected within the mother. When the eggs are hatched inside the mothers body, they still tend to remain in the oviducts for a certain period until they are fully ready to be laid outside, matured, and developed to survive in the external, Since the ovoviviparous animals do not have any, There are some species like sharks and rays which share a specific outlet for gas exchange with the developing babies in the womb itself.

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