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Subcutaneous drug administration: (a) cross section of skin showing depth of needle insertion;
Scattergrams are a mechanism used by political scientists to show patterns and relationships among v
Researchers have found that science instruction can be quite effective in grades 4 to 7.
Gel showing separation of DNA fragments
Limiting factors restrain population growth
Human mtDNA molecule, showing the locations of HVS I and II regions relative to other mtDNA genes