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Most animals are viviparous or oviparous, but there are also some special animals, such as seahorses, which hatch fertilized eggs in their mouths and then put them in a nursery bag on the belly of male seahorses, which is actually a kind of oviparous.
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Parthenogenesis: Present in arthropods and some reptiles and fish, it refers to the mode of reproduction in which an egg develops into an individual without fertilization. It can be divided into occasional parthenogenesis, frequent parthenogenesis, and periodic parthenogenesis.
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Birds, reptiles, and most fish and insects are almost oviparous.
For example, chickens, ducks, fish, frogs, turtles, butterflies, etc. are all oviparous animals. After laying eggs (eggs), oviparous animals hatch and become animals, and their nutrition comes from the eggs themselves.
Viviparous: bats, seals, fur seals, dolphins.
Baboons, pangolins.
Foxes, anteaters, sea otters, domestic animals, felines.
Rodents, primates, monkeys, tigers, cows, sheep, wolves, etc., are all viviparous.
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The water sucks up and analyzes another small water dilute with its own matrix.
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Because the whole process of embryonic development of oviparous animals is provided by yolk material, and viviparous animals suck at the beginning of embryonic development provided by yolk and later by the mother, so the eggs of oviparous animals are much larger than the eggs of viviparous animals. The nutritional needs of the embryo during development are guaranteed.
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Animals that are supposed to reproduce offspring from eggs are called (
Oviparous animals are called (
viviparous animals ). Viviparous animals are generally used (
Breastfeeding) method of feeding small animals. (Note: The middle should be a viviparous animal, because he asks about viviparous animals later.) )
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Oviparous, viviparous, breastfed.
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Oviparous viviparous animals lactate.
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Oviparous, mammal, breastfed.
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In general, birds, reptiles, insects and other animals are oviparous, such as swallows, butterflies, turtles, chickens, eagles and other animals, in addition, a very small number of mammals, such as platypus, etc., are also oviparous. Mammals are generally viviparous, such as cows, sheep, horses, cats, dolphins, baboons, etc.
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There is also asexual reproduction.
Asexual reproduction is a type of reproduction that does not go through the union of germ cells of both sexes, and directly produces a new individual from the mother. The asexual reproduction of animals includes fission, budding reproduction, fracture reproduction and parthenogenesis, etc., from the lower animals can only carry out asexual reproduction to the higher animals only have sexual reproduction.
Sexual dimorphism is difficult to distinguish in lower animals, but can be extremely exaggerated in higher animals. Unlike the absolute dominance of hermaphroditism in plants such as Gao and Mu, the hermaphroditism of animals is very rare.
The picture shows the hydra that adopts budding reproduction:
Sunfish can lay about 300 million eggs at a time.
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A: Exercising your child's concentration can help improve memory. It is also good to take children to exercise outdoors more often, which is also good for improving memory. Having your child memorize some passages every day can also improve memory.