The first vertebrates to leave fossil evidence,jawless fishes appeared during this time:
A) Cambrian period
B) Ordovician period
C) Silurian period
D) Devonian period
E) Carboniferous period
Correct Answer:
Verified
Q29: Characteristics shared by primates include:
A)Flat nails instead
Q30: Small animals called thecodonts and therapsids were
Q31: Homo sapiens first appeared during the:
A)Cretaceous period
B)Tertiary
Q32: Placental mammals appeared during the:
A)Triassic period
B)Jurassic period
C)Cretaceous
Q33: The Burgess Shale fossils are from the:
A)Ordovician
Q35: The first amphibians appeared during the:
A)Cambrian period
B)Ordovician
Q36: The mass extinctions of the Permian period:
A)Paved
Q37: The Mesozoic era lasted from about:
A)65 million
Q38: The amniote egg in which an embryo
Q39: The "Age of Dinosaurs" lasted about 120
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