A mystery emerged in Britain during the 1800s. An Industrial Revolution had just taken hold. Busy factories started to darken the skies with smoke from burning wood and coal. The sooty pollution blackened tree trunks. In short order, Victorian scientists took note of a change, too, among peppered moths (Biston betularia). A new, all-black form emerged. It came to be called B. betularia carbonaria, or the “charcoal” version. The older form became typica, or the typical form.
Birds had been able to easily spot the old-style, lightly colored peppered moths as they settled onto soot-blackened tree trunks. Their new dark cousins instead blended in. The result: those carbonaria were less likely to be eaten.
Not surprisingly, numbers of light-colored moths started to fall as their dark cousins increased. By 1970, in some polluted regions nearly 99 percent of peppered moths were now black.
Source
What process caused changes in the frequency of traits within the peppered moth population?
A artificial selection
B sexual reproduction
C natural selection
D mutation
Answers: 1
Physics, 21.06.2019 18:30, Rusven
An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball
Answers: 1
Physics, 22.06.2019 20:30, aliviafrancois2000
We will use a video to study faraday’s law of electromagnetic induction by analyzing the induction that occurs due a coil of copper wire sliding along an air track that passes through an external magnetic field. specifically, we will: examine some of the main principles behind faraday’s law. apply lenz’s law to determine the direction of the induced emf. take measurements of the induced emf from the voltmeter as the coil passes into and out of the external magnetic field. use the horizontal scale provided to determine the speed of the coil. calculate the magnetic field induced in the coil as it passes into and out of the external magnetic field.
Answers: 2
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