Maculate 发表于 2025-3-21 18:53:00

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枯萎将要 发表于 2025-3-21 22:12:14

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synovial-joint 发表于 2025-3-22 03:13:20

Animal body cavities,The phyla discussed so far have been characterised by a ‘solid’ type of body construction with either mesogloea or mesenchyme filling the space between the external body wall and the gastrodermis. All the remaining animal phyla have a body cavity separating the body wall from the gut.

先兆 发表于 2025-3-22 05:53:14

The invertebrate deuterostomes,euterostome groups: Echinodermata, Chaetognatha, and Hemichor- data. Of these three, the phylum Echinodermata is a large group with a long fossil record and a wide distribution. The others are small and will be discussed together as the lesser deuterostomes.

符合你规定 发表于 2025-3-22 11:05:42

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Medicare 发表于 2025-3-22 13:42:19

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macular-edema 发表于 2025-3-22 20:07:17

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厌倦吗你 发表于 2025-3-22 21:33:22

https://doi.org/10.1007/978-3-031-48509-1 and for this a multicellular structure has proved necessary. Subdividing the body mass into a number of smaller parts permits an increase in size for two main reasons. Firstly, the mere presence of cell walls provides some measure of support to the protoplasm, which when unsupported has a fluid con

沙草纸 发表于 2025-3-23 01:55:15

,Epilogue: Uncaging Chaucer’s Animal Voice,p between them than with other invertebrate groups and is based on their shared radial symmetry. The term ‘Coelenterata’, commonly used as an alternative to ‘Cnidaria’, is actually synonymous with the term Radiata. Whereas Porifera are multicellular forms which function at a cellular level of organi

芳香一点 发表于 2025-3-23 09:37:49

Domesticating the Fable: The Other in the ,tting and waiting rather than active seeking, and locomotion is consequently less important. If an animal has a mouth at one end, and attaches itself by the other, there is no apparent reason why it should not be radially symmetrical since no direction is more important than any other. An essential
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查看完整版本: Titlebook: Animal Diversity; Diana R. Kershaw Book 1983 D. R. Kershaw 1983 Agnatha.Chaetognatha.Crustacea.Ctenophora.Insecta.Integument.Phylum Kinorh