D Question 4 What was the independent variable in this experiment? O total moth population size O tree coloration O presence of birds O number of moths of each color

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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Question 4
What was the independent variable in this experiment?
O total moth population size
O tree coloration
O presence of birds
O number of moths of each color
Transcribed Image Text:Question 4 What was the independent variable in this experiment? O total moth population size O tree coloration O presence of birds O number of moths of each color
Peppered Moth Experiment
Researchers wanted to further test the idea that Peppered Moth
populations around London really shifted due to their increased
visibility to predators on dark trees. Researchers constructed two
sample forest plots, each surrounded by bird-proof netting. In both
enclosures they captured ALL the moths and ALL the birds. Trees in
each enclosure were stripped of lichens so they ALL had dark bark. The
treatments for each enclosure were as follows:
Enclosure A: 50 dark-colored moths and 50 light-colored moths were
released.
Enclosure B: 50 dark-colored moths and 50 light-colored moths were
released, plus 10 birds.
Proportions of dark and light moths were monitored in each enclosure
for 10 years by thorough sampling (sampling did not harm moths).
Results for moth populations after 10 years are reported in the chart
below. In addition, the bird population in Enclosure B was remained
fairly constant over the 10 years and no birds appeared in Enclosure A.
Enclosure Enclosure
A
B
Dark-colored 268
327
moths
Light-colored 285
16
moths
Transcribed Image Text:Peppered Moth Experiment Researchers wanted to further test the idea that Peppered Moth populations around London really shifted due to their increased visibility to predators on dark trees. Researchers constructed two sample forest plots, each surrounded by bird-proof netting. In both enclosures they captured ALL the moths and ALL the birds. Trees in each enclosure were stripped of lichens so they ALL had dark bark. The treatments for each enclosure were as follows: Enclosure A: 50 dark-colored moths and 50 light-colored moths were released. Enclosure B: 50 dark-colored moths and 50 light-colored moths were released, plus 10 birds. Proportions of dark and light moths were monitored in each enclosure for 10 years by thorough sampling (sampling did not harm moths). Results for moth populations after 10 years are reported in the chart below. In addition, the bird population in Enclosure B was remained fairly constant over the 10 years and no birds appeared in Enclosure A. Enclosure Enclosure A B Dark-colored 268 327 moths Light-colored 285 16 moths
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