Answer:
Ibn al-Haytham
Explanation:
he lived in present-day Iraq between 965 and 1039 C.E., as the first scientist.
The largest Yoruba kingdoms produced surplus food, which was sent to cities and this freed city-dwellers from farming, allowing them to become craftspeople or traders.
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Answer:
The percentage of the European population who died due to the black death ranges from 30 to 50%, and in some urban areas, especially in southern European countries like Italy, 60-70 and even 80% of the population died.
The black death was very contagious, had an extremely high mortality rate, and medicine at the time had no means to combat the disease, hence the very high death toll of the plague.
It expands due to the fact the mercury reacts to heat in such a way that makes it rise up the tube.