There is no evidence in the geologic record that multicellular organisms of any kind existed prior to the Cambrian.
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Q6: Pelagic organisms live in the water column
Q7: Burrowing worms are examples of planktonic organisms.
Q8: Plankton are small animals and plants that
Q9: The ammonoids are excellent guide fossils because
Q10: The end-Devonian mass extinction affected polar and
Q12: A worm that burrows into sediments below
Q13: All of the organisms that live on
Q14: Invertebrates are defined as animals with shells.
Q15: Organisms that comprised reef complexes remained virtually
Q16: The Burgess Shale was deposited during the
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