CATDOLL : CATDOLL: Why do snails give birth directly?

The snail is an ovoviviparous animal with a unique reproductive method. The embryonic development and the development of the snail's young are completed in the mother's body. It takes about a year for the fertilized egg to grow into a young snail. The snails lay eggs in batches and begin to reproduce from March to April every year. While producing young snails, the female and male parent snails mate and fertilize, and at the same time, they breed young snails in the mother's body for the next year. A female snail produces about 100 to 150 young snails throughout the year.

Ovoviviparity means "incubation of eggs in vivo", which means that the fertilized eggs produced by the hidden sperm in the animal body remain in the mother's reproductive tract and develop into larvae with the help of the egg's own yolk until the embryo is fully developed and then born. Once mature, the mother's reproductive tract will contract to expel the larvae together with the vitelline membrane. Therefore, the embryos of ovoviviparous animals are properly protected by the mother, and the hatching survival rate is more guaranteed than that of oviparous animals. Common ovoviviparous animals include some sharks, guppies, and some snakes and viviparous lizards.

Ah~ Are you also in the sixth grade of primary school? I also had a hard time doing the "Calling Bright Classroom Homework". Although I don't know why snails can give birth directly, I can tell you how to do this question. . .

Answer: Because snails are born from the womb or buried, they can give birth directly to offspring.

It's that simple.

This is a characteristic of mollusks.