Answer:
Hand dexterity that allowed humans to create changes to their environment. This included cooking food and creating complex tools. Cooked food provided much more and better protein at less work. This meant that humans could spend their time on things other than chewing food.
Answer:
It is a negative ion that has one more valence electron than a neutral bromine atom.
Explanation:
The bromine atom (Br) accepts one electron and forms the bromide ion (Br-), which carries a unit negative charge. Thus, the charge of the bromide ion is -1.
Bromine is corrosive to human tissue in a liquid state and its vapors irritate eyes and throat. Bromine vapors are very toxic with inhalation. Humans can absorb organic bromines through the skin, with food and during breathing. Organic bromines are widely used as sprays to kill insects and other unwanted pests.
Its salts are found in the crust at about . 4 parts per million. Bromine is only the 64th most common element on Earth. It is more rare than three quarters of the elements that comprise the Earth's crust
bromine is commonly found in highly un-reactive bromide salts - in much the same way that the poisonous green gas chlorine is commonly found in boring sodium chloride, table salt. ... Today, bromine is extracted on an industrial scale from salt lakes that are especially rich in the element, above all the Dead Sea
Natives lost control of land and independence, expanded population which resulted in famine, cash crops-displaced the food crops, which resulted in famine, natives died of new diseases like smallpox, thousands of people died because of rebellions
Answer:
La bipolaridad internacional causada por la Guerra Fría, que se desarrolló desde 1945 hasta 1991, tuvo como consecuencia principal la caída del comunismo del pedestal político en el que se encontraba hasta ese momento. El comunismo, en su esencia, fue derrotado por el capitalismo democrático defendido por el bloque occidental y, por lo tanto, perdió influencia en los países en los cuales se encontraba funcionando hasta ese momento. Así, países de Europa del Este gradualmente fueron dejando atrás el comunismo, y comenzaron a abrazar sistemas de mercado: liberalismo, socialdemocracia, etc.
Además, proscribió el uso de armas nucleares en el ámbito internacional, toda vez que la tensión generada en dicho período histórico llevó a severas restricciones y controles en la posesión y utilización de materiales bélicos nucleares.
