Color in peppered moths is controlled by genes. a light-colored variety and a dark-colored variety of a peppered moth species exist in nature. the moths often rest on tree trunks, and several different species of birds are predators of this moth.

before industrialization in england, the light-colored variety was much more abundant than the dark-colored variety and evidence indicates that many tree trunks at that time were covered with light-colored lichens.

later, industrialization developed and brought pollution which killed the lichens leaving the tree trunks covered with dark colored soot. the results of a study made in england are shown in the graph below.

state one possible reason that the light-colored variety was not completely eliminated from the polluted environment. be sure your reason can be supported by the evidence shown.

The light colored moths don't extinct but they become less in number due to natural selection.

Natural selection is the phenomenon in the biology in which the group of organisms which is most suitable to the changing environment will survive and increase its population by reproduction while non suitable group will decrease in number due to low ability to cope with changing environment.

In this question before industrial revolution, light color moths have very light places like lichens to hide themselves from the predators by attaching to light color lichens.

But after industrial revolution due to pollution white lichen die and the habitat for white moths become less and they are more visible to the predators.

That's why their number decreases and dark color moths increase in number.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%