| 21. | Bivalves have an open circulatory system that bathes the organs in hemolymph.
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| 22. | Freshwater bivalves in the order Unionoida have a different lifecycle.
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| 23. | Bivalves inhabit the tropics, as well as temperate and boreal waters.
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| 24. | They are more exposed to attack by predators than the burrowing bivalves.
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| 25. | There are limitations to the use of bivalves as bioindicators.
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| 26. | Brachiopods, bivalves, echinoderms, bryozoans and corals were particularly affected.
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| 27. | In bivalves it is usually part of the feeding structure.
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| 28. | The current first order bivalve Fresnel lens was installed at that time.
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| 29. | Their diet consisted of marine bivalves, brachiopods, and other invertebrates.
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| 30. | Inoceramids are bivalve Mollusca related to today's mussels.
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