In many birds the spaces between the metasternum and the posterior processes and again the spaces between this and the oblique process are filled up by proceeding ossification and either remain as notches, or as fenestrae, or they are completely abolished so that the breastbone is turned into one solid more or less oblong plate. [Please select]
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--between the medialmost margins of the prominent fenestrae in the posterodorsal parts of the squamosal bones. [Please select]
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If modern views of selection are applied to the problem of explaining the appearance of temporal fenestrae, the possibility cannot be ignored that: 1. [Please select]
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After the appearance of temporal fenestrae, selection for the classical factors is quite acceptable to explain the further development of fenestration. [Please select]
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