The oldest organic reefs with skeletal structures formed during __________ and were composed of __________.
A) Late Proterozoic; brachiopods
B) Early Cambrian; archaeocyathids
C) Earliest Cambrian; stromatolites
D) Late Cambrian; sponges
Correct Answer:
Verified
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
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)
Q19: The trilobites first appear during
A) Early Ordovician.
B)
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