Data on fossil mammalian herbivore species in the Great Plains of North America The Great Plains...

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Data on fossil mammalian herbivore species in the Great Plains of North America The Great Plains became a grassland 22-26 MYA. The grassland became dominated by C4 grasses 8 MYA. Data presented are fossil evidence. (1) Plot the percentage of mammalian herbivores over time. (2) Does the percentage of herbivores increase when grasslands appear? (3) Does the percentage of herbivores increase when C4 grasses appear? Years before now (MYA) -38 -36 -34 -32 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 Total number Number of of mammalian fossil herbivore fossil browser species species 20 30 42 39 40 27 20 23 27 34 33 36 47 25 36 22 22 16 15 20 30 42 39 39 26 16 18 21 28 25 18 22 10 12 8 945 Number of fossil grazer species 0 0 0 0 1 1 4 5 6 6 8 18 25 15 24 14 13 12 10 % of herbivores that are grazers 0% 0% 0% 0% 3% 4% 20% 22% 22% 18% 24% 50% 53% 60% 67% 64% 59% 75% 67% Data on fossil mammalian herbivore species in the Great Plains of North America The Great Plains became a grassland 22-26 MYA. The grassland became dominated by C4 grasses 8 MYA. Data presented are fossil evidence. (1) Plot the percentage of mammalian herbivores over time. (2) Does the percentage of herbivores increase when grasslands appear? (3) Does the percentage of herbivores increase when C4 grasses appear? Years before now (MYA) -38 -36 -34 -32 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 Total number Number of of mammalian fossil herbivore fossil browser species species 20 30 42 39 40 27 20 23 27 34 33 36 47 25 36 22 22 16 15 20 30 42 39 39 26 16 18 21 28 25 18 22 10 12 8 945 Number of fossil grazer species 0 0 0 0 1 1 4 5 6 6 8 18 25 15 24 14 13 12 10 % of herbivores that are grazers 0% 0% 0% 0% 3% 4% 20% 22% 22% 18% 24% 50% 53% 60% 67% 64% 59% 75% 67%

Answer rating: 100% (QA)

1 Plotting the percentage of mammalian herbivores over time Years before now MYA of herbivores 38 0 ... View the full answer