What do catalyst do in chemical reactions?

Which of these correctly describes the difference between processes that take place in prokaryotic and eukaryotic cells?

Paleontologists have found plant fossils deep within the layers of the north polar region. these leaf fossils have been labeled as to the rock layers they were found in, with the lower numbers being layers close to the earth's surface and higher numbers representing deeper layers. according to the numbers of these four leaf fossils, what might you infer?

Organic molecules are sometimes found within meteorites that crash into earth. which meteorite characteristic is similar to what most likely was present on early earth?