Explain the way yolk sac is formed
Explain the way yolk sac is formed? Also state the purpose of yolk sac?
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The yolk sac is formed from covering of vitellus by some cells originated from the primal gut. The yolk sac stores vitellus, the major nourishment source of non-placental embryos.
Evolutionarily protochordates can be intermediate animals between the invertebrates and vertebrates. Consider the scientist is testing hypothesis, which states that vertebrates are evolved from echinoderms. Being research objects a newly evolved protochordate species,
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