The Precambrian-Cambrian boundary represents the first appearance of ____.
A) vertebrates
B) amphibians
C) reptiles
D) animals with skeletons
E) animals with soft bodies
Correct Answer:
Verified
Q2: All chordates are vertebrates.
Q13: Which feeding group ingests sediment and extract
Q14: Trilobites, an organism abundant in the Early
Q15: Sessile organisms _.
A)move about freely
B)move only to
Q16: An organism classified as an autotroph _.
A)is
Q18: One of the most significant roles of
Q19: Fusulinids, greatly diversified in the Pennsylvanian and
Q20: Hox genes _.
A)control the formation of shells
B)control
Q21: The 360-million-year-old Acanthostega _.
A)had limbs but could
Q22: Over geologic time, _ open up vast
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