The first of our phyla, the Chordata, shows up right after the Cambrian period.
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Q12: The earliest evidence of what has come
Q13: The beginning of the Cambrian shows fossils
Q14: A tetrapod is known from its four
Q15: An example of analogy in evolution would
Q16: As of now, paleontologists put the origin
Q18: The first amniotes were insects.
Q19: Angiosperms are plants with flowers.
Q20: Fossil evidence of first mammals is heterodont
Q21: An example of the principle of homology
Q22: The principle that claims scientists believe populations
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