Afossil that is widespread geographically but only occurs in one or a small number of rock layers is called
a rare fossil
a marker fossil
an intrusive fossil
an index fossil

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

How many structures do prokaryotic cells have in common with the eukaryotic cells? a. 2b. 3c. 4d. 5

Which state in the united states founded the first true public zoo?