The variation in a population is called _____________________.
Fill in the blank(s) with the appropriate word(s).
genetic diversity
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Which of the following has NOT been a compelling factor pushing rural people to migrate to cities in Latin America?
A) individual choices made by the young and the better educated to seek opportunities B) mechanization of agriculture decreased the labor needs in the countryside C) inability of the peasantry to gain ownership of arable farmland from the entrenched latifundia system D) conditions (educational access, drinking water, health care) are better in urban areas E) to take advantage of government funded programs encouraging people to migrate to large urban areas
What affects the residence time of an element?
a. Its saturation level b. Its chemical equilibrium in water c. Its chemical activity in water d. The principle of constant proportions
The bond angles around the carbon atom in methane (CH4 ) are all:
A) 180° B) 120° C) 109.5° D) 90°
Relatively few impact craters have been discovered on Earth because ________.
A. weathering, erosion, and tectonic processes mask them B. the gravitational field is too weak C. most rocks are too resistant to crater D. bolides are very rare in this region of space E. Jupiter is so large it deflects them away from Earth