The answer is most likely A)
When competition for resources is unnecessary
The inhalation of mercury vapor can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. Mild, sub-clinical signs of central nervous system toxicity can be seen in workers exposed to an elemental mercury level in the air of 20 μg/m3 or more for several years.
Answer: They led to larger urban cores that used professional armies to increase their territory and enslave people.
Explanation:
Trade generally brings about wealth and this was the case for West African societies as a result of interactions with the Muslim traders who crossed the Sahara to trade with them.
As a result of the gains from trade, wealthy urban cores and cities were formed such as Timbuktu, Gao and Agadez
. The wealth the rulers of these cities acquired enabled them to use professional armies to conquer more territory.
Indeed one of the richest men in history, Mansa Musa ruled over an empire that became so rich due to trade in his territory.
According to science, yes – happiness, indeed, has a heritable component. It’s a finding that is surprising and not surprising at the same time. It's surprising because of our culturally-sanctioned convictions that with our choices, thoughts, and behavior, we have the final say on how well we function in our lives, not our circumstances. But it's also not surprising because if our genes play a part in shaping who we are in the world, they will also have a say in how we pursue and find happiness. People might inherit genes that put them in advantageous or less favorable positions. Depression is genetic...
