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Answer:
They all start out as a single cell and develop the same pattern of structures such as tails and pharyngeal slits. Some of those structures remain as the embryo gets older, but others go away.
Explanation:
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All vertebrates evolved from a common ancestor, the genetic data that directs their development is nearly the same.
How do these similarities support the theory of evolution?
Numerous types of proof support the theory of evolution Homologous structures supply proof for shared ancestry, while analogous structures exhibit that alike selective forces can produce similar adaptations
Thus, the development of a human, pig, frog, and chicken the same due to genetic data.
To learn more about evolution click here;
https://brainly.com/question/13492988