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Search Results for: quill

quill 1. One of the large feathers of a bird's wing, or one of the rectrices of the tail; also, the stock of such a... Read More

Feather 1. (Science: ornithology) One of the peculiar dermal appendages, of several kinds, belonging to birds, as contour... Read More

The human heart structure consists of heart chambers (2 atria and 2 ventricles) that differ functionally from each other.... Read More