In embryogenesis, the difference between blastula and gastrula is

Blastula is a single-layer embryo, and gastrula is a two-layer embryo, starting with flatworms is a three-layer

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.