The "Cambrian explosion" refers to
A) the mass extinction of dinosaurs.
B) the origination of all major phyla of animals.
C) the development of the first true cell.
D) the origination of life.
E) the creation of Earth.
Correct Answer:
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Q2: A skeleton has a foramen magnum tucked
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Q8: The Mesozoic era lasted from
A) 65 million
Q12: Swinging from one arm to the other
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Q15: An invertebrate is an animal that
A) does
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Q21: Pinworms and hookworms belong to the phylum
A)NematodA.
B)Annelida.
C)Platyhelminthes.
D)Porifera.
E)Cnidaria.
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