Before 1800, most peppered moths in england were light-colored. during the industrial revolution, soot and industrial wastes darkened tree trunks. gradually, the light-colored moths became rare, and the dark-colored ones became abundant. what role did natural selection play?

a. natural selection created the variation in the population, and then acted accordingly.
b. natural selection acted on the variation that was present in the population.
c. natural selection acted indiscriminately on both color variations.

Where in the body can you find chemoreceptors? a. on the skin and ears, to detect pressure, touch, motion, and sound b. on the retina, to detect a single photon of light c. on the skin, to detect temperature or specific chemicals d. on the tongue and in the nose, to detect taste or odor

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.

The wind is to parities grasses because it them