Which development caused a sharp decline in population levels in the americas beginning in the late 15th century?
a. decline in agriculture caused by the commercial revolution
b. diseases introduced by the columbian exchange
c. introduction of slavery through the triangular trade
d. immigration to asia during the age of exploration

What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? they created the scientific method to outline how science should be conducted. they were able to find the orbit of a comet and predict the year of its return. they discovered the three newest planets--uranus, neptune, and pluto. they explained why objects appear to have color.

Brainliestttme : )) -why do people commit acts of terrorism?

The service industry in the united states grew in the late 1800s. what was one effect of that growth? the number of people with jobs in factories as unskilled workers decreased. the number of people with jobs in factories as unskilled workers increased. the middle class grew as people took jobs as clerks, lawyers, and teachers. the middle class shrank as people left jobs as clerks, lawyers, and teachers.