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TrapxQueen

vertebrates are group into the phylum of chordate. 
Although all the chordate physically have a great differences but during the embryonic development there are 4 similar structure: 
1. have gills(which depend on which class if for fishes the gills will use for respiration if for mammals gills will develop for hearing) 
2. have notochord( which will develop into back bone） 
3。nerve chord 
4. tail 

luisvaschetto

The structures that all vertebrate embryos initially have include notochord, spinal cord, gill arches and primitive kidneys.

  • The notochord can be defined as a midline structure common to all embryos of vertebrates, which serves as a primary skeletal element of the developing embryo.

  • The spinal cord is a tubular structure consisting of nervous tissue, which is derived from the neural tube in the developing vertebrate embryo.

  • Gill arches, also known as branchial arches, are a primitive condition of vertebrates, which can be observed during the fourth week of embryo development.

In conclusion, the structures that all vertebrate embryos initially have include notochord, spinal cord, gill arches and primitive kidneys.

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