1. A star is 520 light years from Earth. During what event in history did the light now arriving at Earth leave the star?

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A light year is the distance which is equal to 9,460,730,472,580.8 km, so:  

= 4.91957985 X km  

which is distance travels by the light.  Now what time it takes light to travel distance we found.  

A year has 365.25 days, so,

= 31557600 seg/year

The light speed in the space is equal to 299,792.458 km/s, so:  

4.91957985 x = 520 years

if today, August, 2020, then

2020 - 520 = 1500

Spanish and Portuguese spread out over the southern part of the Western Hemisphere and bring in America brought to Spanish colony of Santo Domingo in year 1500.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.