Answer:
As evolution became widely accepted in the 1870s, caricatures of Charles Darwin with the body of an ape or monkey symbolised evolution.
Hydrogen bonding, ionic bonding, dipole-dipole interactions, and London dispersion forces!
Manufacturers add sugars to their cigarette sometimes in the form of honey, etc. This makes cigarettes more enjoyable, particular and addictive in a way.
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The two-layered sac surrounding the heart is the pericardium.
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