The ammonoids are excellent guide fossils because of distinctive physical features, short species ranges, and a wide geographic distribution.
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Q4: Devonian mass extinctions were partly caused by
Q5: The Burgess Shale is significant because it
Q6: Pelagic organisms live in the water column
Q7: Burrowing worms are examples of planktonic organisms.
Q8: Plankton are small animals and plants that
Q10: The end-Devonian mass extinction affected polar and
Q11: There is no evidence in the geologic
Q12: A worm that burrows into sediments below
Q13: All of the organisms that live on
Q14: Invertebrates are defined as animals with shells.
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