Genetic drift refers to ________
A) a change in the overall distribution of a population
B) a change in the frequency of a population's genes because of mutation
C) a change in the frequency of a species' occurrence
D) a change in the frequency of genes in a population because of tectonic plate movement
E) a change in the frequency of a population's inherited trait brought about by a chance event
E
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Where does the majority of oil pollution in the ocean come from?
A. blowouts (oil escapes under high pressure from a borehole on the ocean floor ) B. tanker accidents C. fisheries D. runoff from land E. cruise ships
A volcanic neck can form by
A) erosion of the volcano, leaving behind the solidified conduit inside the volcano. B) erosion of overlying rock layers exposing the conduit below the volcano. C) Both of these are correct.
Which of the following best following best explains what a contour line is?
a) a line that connects the peaks and valleys of an area b) a line that represents continuous points of equal elevation c) a line that connects all the high points on a topographic map d) a line that separates the tree from the grasslands on the shaded relief maps.
Radar images typically are displayed using various colors to denote the intensity of precipitation, with ____ representing the lightest precipitation and ____ representing the heaviest precipitation
a. white; black b. light grey; dark grey c. orange; green d. dark blue or purple; yellow or bright green e. light blue or green; orange or red