Each of the first three Cambrian mass extinctions of trilobites was probably due to
A) gradual climatic cooling.
B) sudden climatic warming.
C) sudden climatic cooling.
D) gradual climatic warming.
Correct Answer:
Verified
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
Q14: The oldest organic reefs with skeletal structures
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)
Q20: The organism that left tracks on sediment
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