| 11. | Most starfish embryos hatch at the blastula stage.
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| 12. | In " Xenopus " embryos, the blastula is composed of three different regions.
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| 13. | Within the blastula, inner blastomeres are generally non-polar while epithelial cells demonstrate polarity.
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| 14. | Named by William Ballard, the pharyngula stage follows the blastula, gastrula and neurula stages.
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| 15. | In sponges, blastula larvae swim to a new location and develop into a new sponge.
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| 16. | By manipulating the cell signals during the blastula stage of development, various tissues can be formed.
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| 17. | Cell-cell interactions mediated by E-cadherin are crucial to blastula formation in many animals.
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| 18. | They showed that uncommitted cells of the zebrafish blastula animal pole into a well-developed embryo.
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| 19. | Von Baer studied the embryonic development of animals, discovering the blastula stage of development and the notochord.
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| 20. | The study of the blastula and of cell specification has many implications on the field of fertility treatments.
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