The mass extinction at the end of the mesozoic era was caused by a. solar radiation c. an ice age b. a meteor or asteroid colliding with earth d. volcanic activity

Your answer should be

B. A meteor or asteroid colliding with Earth

Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.