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A Wasp Preying on House-Flies and Stable-Flies

✍ Scribed by CALLAN, E. MCC.


Book ID
109545362
Publisher
Nature Publishing Group
Year
1945
Tongue
English
Weight
125 KB
Volume
155
Category
Article
ISSN
0028-0836

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I n most vertebrates vitamin A is an essential dietary requirement. It acts as a stimulus to the building of new cells, or in conjunction with a specific protein to form rhodopsin, which is necessary for rod vision. In contrast, the role of vitamin A in invertebrates, insects in particular, is still