Which of the following sequences is correct for the development of a vertebrae? (HELP BIOLOGY EXAM SOON!!)?
a. fertilization, cleavage, gastrula, zygote, blastula
b. fertilization, zygote, cleavage, blastula, gastrula
c. zygote, blastula, cleavage, gastrula, fertilization
d. cleavage, blastula, fertilization, zygote, gastrula
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