During Ordovician, the decline of stromatolites was due to
A) grazing by marine animals.
B) competition from organic reefs.
C) the mass extinction among trilobites.
D) attacks by predators such as the nautiloids.
Correct Answer:
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Q3: _ found as fossils show us that
Q4: _ are the horn corals, which became
Q5: The burrow Treptichnus pedum marks the base
Q6: The hard-skeleton burrowers of the Ordovician were
A)
Q7: _ experienced a mass extinction at the
Q9: Cambrian seas
A) rarely encroached on the land
Q10: Early Cambrian suspension feeders included
A) anomalocarids and
Q11: The main Ordovician floating animals were the
A)
Q12: The earliest known vertebrate animals were the
A)
Q13: The largest Ordovician predator was a
A) variety
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