Over the past 600 million years,the overall trend in the number of species has been ________.
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Q9: Total species diversity,or species richness,of individual communities
Q10: Which group of plants emerged first?
A)angiosperms
B)gymnosperms
C)pteridophytes
D)conifers
Q11: Patterns of species diversity for pelagic and
Q12: As structural diversity within plant communities increases,the
Q13: As latitude increases,the number of marine species
Q15: The end of the Permian period was
Q16: Angiosperms emerged
A)100 million years ago.
B)200 million years
Q17: Which time period has the greatest richness
Q18: A mass extinction of large mammals occurred
Q19: Total species diversity,or species richness,across all communities
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