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In 2018 researchers suggested an alternative model in which "the disease was spread from human fleas and body lice to other people". The second model claims to better fit the trends of the plague's death toll, as the rat-flea-human hypothesis would have produced a delayed but very high spike in deaths, contradicting historical death data. [64] [65]
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The structure of the molecule of urea is O=C(−NH 2) 2.The urea molecule is planar when in a solid crystal because of sp 2 hybridization of the N orbitals. [8] [9] It is non-planar with C 2 symmetry when in the gas phase [10] or in aqueous solution, [9] with C–N–H and H–N–H bond angles that are intermediate between the trigonal planar angle of 120° and the tetrahedral angle of 109.5°.
The tube-like heart (green) of the mosquito Anopheles gambiae extends horizontally across the body, interlinked with the diamond-shaped wing muscles (also green) and surrounded by pericardial cells (red). Blue depicts cell nuclei. Basic arthropod body structure – heart shown in red. Arthropods and most mollusks have an open circulatory system.
[W 50] [114] Jimmy Wales has described Wikipedia as "an effort to create and distribute a free encyclopedia of the highest possible quality to every single person on the planet in their own language". [W 51] Though each language edition functions more or less independently, some efforts are made to supervise them all. They are coordinated in ...
Jehovah's Witnesses is a nontrinitarian, millenarian, restorationist Christian denomination. [8] In 2023, the group reported approximately 8.6 million members involved in evangelism, with around 20.5 million attending the annual Memorial of Christ's death.