The largest Ordovician predator was a
A) variety of stromatoporoid.
B) straight-shelled nautiloid.
C) species of starfish.
D) bivalve mollusk.
Correct Answer:
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Q8: During Ordovician, the decline of stromatolites was
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)
Q14: The oldest organic reefs with skeletal structures
Q15: Each of the first three Cambrian mass
Q16: Pikaia was a swimming chordate whose fossils
Q17: What was the position and orientation of
Q18: The conodontomorphs first appeared during
A) Early Ordovician.
B)
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