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The two reasons for vertebrates to evolve from oviparity ( Egg-laying) to viviparity (Giving live birth) are :-
1. To increase the number of successful births as in viviparity the offspring is protected by the mother whereas in oviparity eggs laid can easily be eaten by other animals. Hence viviparity is selected by natural selection and they evolved to viviparity.
2.In oviparity the youngs developed are mostly poor as no care is given by the mother. In viviparity the youngs get full care from the mother in terms off oxygen and nutrients so the youngs developed are more healthy in viviparity. So they were selected by natural selection and were evolved to viviparity.
What else can I help you with?
Is a horse a oviparous or viviparous?
Viviparous
Are ants viviparous or oviparous?
Ants are oviparous but can become viviparous depending on the surrounding temperatures in which it lives. If they are sheltered from the wind they can become viviparous.
Are raccoons viviparous or oviparous?
Raccoons are viviparous - they are placental mammals.
What is the difference between oviparous and viviparous?
Oviparous animals lay eggs that develop and hatch outside of the mother's body, while viviparous animals give birth to live offspring that have developed inside the mother's body. Oviparous animals include birds and most reptiles, while viviparous animals include mammals and some reptiles.
Is the duck an oviparous or viviparous animal?
oviparous: lay eggs, the 'ovi' part means egg
Is horse oviparous or viviparous?
Viviparous
Is a horse a oviparous or viviparous?
Viviparous
Is dolphin oviparous or viviparous?
VIVIPAROUS
Is the earthworm viviparous or oviparous?
oviparous
Is earthworm oviparous or viviparous?
oviparous
How are oviparous, viviparous, and ovoviviparous different?
No placenta in viviparous and oviparous but there is placenta in ovoviviparity
Is octopus oviparous or viviparous?
Octopus is a oviparous
Are the mosquito oviparous or viviparous?
Cockroach are three types in reproduction - oviparous, viviparous and ovoviviparous. Most cockroach are oviparous.
Is the tree frog a oviparous or viviparous?
viviparous
Is the panda viviparous or oviparous?
Pandas are viviparous.
Is crane is oviparous or viviparous?
Oviparous animals are
Are ants viviparous or oviparous?
Ants are oviparous but can become viviparous depending on the surrounding temperatures in which it lives. If they are sheltered from the wind they can become viviparous.
