What happened at the end of the Mesozoic era, but did not happen at the end of the Paleozoic era?
A. An ice age occurred.
B. There were major asteroid impacts.
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C. A supercontinent broke up.
D. There were mass extinctions.

Which type of respiration takes place when there is no oxygen present

How far away is the nearest black hole from earth?

The image shows a sandstone formation with visible bands of different colors. what do the bands indicate about how this sedimentary rock was formed? choose two answers. a). the rock was made from more than one material. b). water was absent during the compaction and cementation process. c). sediments and other matter were deposited in layers before lithification. d). the rock was stretched horizontally by the pressure from surrounding rocks. e). layers of hot liquid in the rocks cooled and solidified at different tempatures