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Example: Species bias
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Embryophytes
(land plants) -
Most
plant database entries are from the land plants.
Spermatopsida
(seed plants) -
Most
of the land plants studied are seed plants
Note: Trees from Tree of Life (http://tolweb.org). These trees are pending
review.
The whole point of this example is to emphasize that not only do biases exist,
but the extreme degree to which databases may misrepresent distributions
of real things in real populations.