Draw and label x.s. of Amphioxus, amphibian, avian and mammalian clavage and blastula stages. Label the following parts whenever present: animal and vegetal poles, blastomeres: micromere and macromere, blastodisc, blastocoel, trophoblast, innercellmass Model Organism Early Cleavage Mid-cleavage Late Cleavage Blastula   Amphioxus or echinoderm             Amphibia

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