| 21. | Further development is by budding of new zooids.
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| 22. | These colonies can grow thousands of individual zooids in a relatively short period of time.
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| 23. | Pyrosome colonies grow by budding off new zooids near the posterior end of the colony.
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| 24. | These spines make it difficult for the nudibranchs to access the polypide of the zooid.
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| 25. | One side of its surface was covered in spots, which might have been zooids.
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| 26. | The new colony grows by asexual reproduction, with new zooids budding off existing ones.
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| 27. | Larvae undergo metamorphosis and become filter-feeding zooids within 5 15 minutes of settlement.
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| 28. | They contain contain 8 zooids each 10-12�m long by 5-6�m wide.
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| 29. | Some encrusting colonies may grow to over and contain about 2, 000, 000 zooids.
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| 30. | In species with calcareous exoskeletons, these do not mineralize until the zooids are fully grown.
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