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  • Principal evolutionary trends from primitive morphologies, such as exemplified by Eoredlichia, include the origin of new types of eyes, improvement of enrollment and articulation mechanisms, increased size of pygidium (micropygy to isopygy), and development of extreme spinosity in certain groups. (wikipedia.org)
  • Compounds that include a single 1-phenyl-2-propene moiety in their structure. (nih.gov)
  • HN - 2020 (1980) BX - Formalinized Allergoid BX - Formalized Allergoid BX - High Molecular Weight Allergoid FX - Desensitization, Immunologic MH - Allylbenzene Derivatives UI - D000081248 MN - D2.455.326.271.122.180 MN - D2.455.426.559.389.12 MS - Compounds that include a single 1-phenyl-2-propene moiety in their structure. (nih.gov)
Stage1
  • The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago) and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. (wikipedia.org)