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10 Cards in this Set
- Front
- Back
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what led to the discovery of invertebrates?
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ediacaran and trace fossils
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what is used to classify invertebrates?
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molecular palenontology
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when were invertebrate shells developed?
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in the cambrian period
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Do sponges and cnidarians have little or a lot of internal specialization?
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little
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what are 4 evolutionary trends?
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specialized cells, body symmetry, cephalization, segmentation, coelem, embryological development
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how do simple invertebrates digest?
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intracellular
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how do sponges digest food?
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archaeocytes
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how do terrestrial invertebrates breathe?
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respiratory surfaces covered with water
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how do arthropods and mollusks circulate?
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open
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how do annelids and bigger mollusks circulate?
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closed
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