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In nature, different groups of animals have different ways of reproduction. In general, animals reproduce in ways that are nothing more than sexual reproduction and asexual reproduction. Because both oviparous and mammals have sexual reproduction, the difference in their reproduction is nothing more than egg or viviparity In fact, viviparity is not superior to oviparity.
Why? First of all, there are relatively few single reproductions in viviparous animals.
A pig can give birth to about 10 offspring in one litter, and a rabbit can give birth to about 10 offspring on average. Although pigs and rabbits are very fertile in mammals, they are somewhat resistant in oviparous animals. Let's not talk about any fish that can lay tens of thousands of eggs at a time, but animals that can lay hard-shell eggs, such as crocodiles, can lay 20-90 eggs in a breeding period, and pythons can lay up to 100 eggs at a time.
If it is a normal animal, it is common for mammals to lay 1-3 eggs at a time, but ordinary birds lay at least 4-6 eggs in a breeding period. The placenta receives oxygen and nutrients from the mother, and most of the nutrients needed for embryonic development come from the mother. Spawning:
The egg develops into a new individual outside the body. Most of the nutrients needed for embryonic development come from the yolk, and the egg is much larger than the egg of viviparous animals.
Egg viviparity: The embryo develops in the body, but most of the nutrients needed for embryonic development come from the egg yolk. With the exception of the platypus, which lays eggs and lactates, oviparous animals reproduce from eggs, and they are born with a reliable common diet.
Viviparous animals reproduce with embryos and are fully developed. Only viviparous, this mammal, which is usually lactating viviparous after birth, is more evolved, its larvae are more fully developed in the mother's body, and the survival rate of the offspring is also higher.
Animals that are capable of viviparity and egg laying are known as amniotes. When they reproduce, they can completely get rid of the water environment and get rid of the restrictions of the environment. During embryonic development, they can form amniotic fluid on their own, creating a water environment, so they have an evolutionary advantage.
Viviparous animals are more adaptable to their environment by developing embryos in their mother's womb. Mammals are the only animals that can provide nutrients directly from their mothers and are the highest organisms in nature.
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Because mammals need oxygen and nutrients in their bodies to be able to completely break free from the constraints of the environment, viviparous animals will be more adaptable to the environment, while animals hatched from eggs are susceptible to disturbance and affect survival.
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Because the body structure of mammals will be more complex, the distribution of some tissues and organs will be more detailed.
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This is just prejudice, and it is the same with any animal, whether it is a mammal or any other animal.
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Truly. Strictly speaking, there are no superior or inferior organisms, because any living thing that exists, even those that already exist on Earth, is the result of a long period of evolution and natural selection.
process. Mammal.
viviparous) and egg-laying animals (oviparous) are the same, they differ only in reproduction and lifestyle. If we put aside the pros and cons of species and talk about high and low, it is undoubtedly "playing hooligan".
<> mode of reproduction is not a factor that determines "high and low" In nature, different groups of animals have different ways of reproduction, and on the whole, animals do not reproduce more than sexual and asexual reproduction.
Two major categories because of oviparous animals.
and mammals are sexually reproduced, so the reproductive differences between them are no more than eggs or viviparity. In fact, viviparity is not superior to oviparity. Why do you say that?
The single reproduction of viviparous animals is comparatively smaller. Let's pick some mammals that can be fertile. Pigs can give birth to about 10 offspring per fetus, and rabbits can give birth to about 10 offspring per fetus on average.
This is a good question about biology and life. It is also a kind of propaganda of "popular science" and "analysis".
It is an indisputable fact that mammals have a much higher IQ than egg-laying animals. Most birds are not of high intelligence and are fierce by nature! The Covey bird is the only intelligent bird, and the snake and crocodile are ferocious! There is little wisdom other than his cruel nature. Sea turtle.
More or less intelligent animals.
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Viviparous animals reproduce in the womb and are fully developed, so their intelligence is also better than that of ordinary people; Another reason is that the number of viviparous animals is generally small, while the number of oviparous animals is relatively large, so the nutrients need to be dispersed, which also leads to the limited amount of energy absorbed by each embryo.
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Mammals have a more complex brain development than oviparous, so they are more advanced than these animals.
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This is due to the fact that mammals are the highest organisms. The reason for this is that mammals are also the highest stage in the history of development. And the relationship with human beings is very close.
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Of course, there are many reptiles of eggs.
The vast majority of reptiles are oviparous, that is, laying eggs, and only a few reptiles are ovoviviparous.
WhileThere are no "mammalian reptiles" at allNone of them. Because "mammal" is a mammalian characteristic, not a reptilian one. As long as it is a reptile, it is impossible to breastfeed.
So, there are many reptiles of eggs.
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There are more reptiles in lactation.
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Reptiles are more oviparous.
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