The change in tree trunk color from light to dark can be attributed to factors such as exposure to sunlight, moisture levels, and the age of the tree. Sunlight can cause bark to darken over time due to the production of protective compounds, while damp conditions may promote the growth of fungi or lichens that alter the appearance. Additionally, as trees age, their bark often thickens and changes color due to natural processes, resulting in a darker appearance.
The industrial revolution
Burning of coal during the industrial revolution and later deposited soot on the trees.
Changes in allele frequencies Novanet
Changes in allele frequencies Novanet
Changes in allele frequencies Novanet
Changes in allele frequencies Novanet
The industrial revolution in England (the black smoke form all the factory chimneys) produced allot of environmental pollution and the trees in the worst affected areas were covered in soot. Now thankfully this pollution has ceased and the tree trunks are no longer black...I understand that the areas of black peppered moth variants are now reverting to the light colored variety.;)
Bromine water will go clear in the dark, while hexane will not change color in either light or dark conditions.
because dark colours absorb light and light colours reflect light
The object causing the shadow is blocking the light, thus a shadow caused.
It made the dark less frightening.
Industrial pollution making the tree bark on which the moths hide to become dark and the pressures of evolutionary natural selection.