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  2. Blood - Wikipedia

    en.wikipedia.org/wiki/Blood

    4.7 to 6.1 million (male), 4.2 to 5.4 million (female) erythrocytes: [13] Red blood cells contain the blood's hemoglobin and distribute oxygen. Mature red blood cells lack a nucleus and organelles in mammals. The red blood cells (together with endothelial vessel cells and other cells) are also marked by glycoproteins that define the different ...

  3. HK 4.6×30mm - Wikipedia

    en.wikipedia.org/wiki/HK_4.6×30mm

    The 4.6×30mm (designated as the 4,6 × 30 by the C.I.P.) [6] cartridge is a small-caliber, high-velocity, smokeless powder, rebated, bottleneck, centerfire cartridge designed for personal defense weapons (PDW) developed by German armament manufacturer Heckler & Koch (HK) in 1999.

  4. Demographics of the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_the_United...

    The population of the United Kingdom was estimated at 67,596,281 in 2022. [1] It is the 21st most populated country in the world and has a population density of 279 people per square kilometre (720 people/sq mi), with England having significantly greater density than Wales, Scotland, and Northern Ireland. [1]