The soils of tropical rain forests tend to be nutrient-poor due to:
a. extensive wind erosion.
b. the fact that nutrient minerals are stored primarily in the vegetation.
c. removal of native plants, largely grasses, depleting the nutrient minerals.
d. sediment washing into streams from intact forests.
e. poor crop rotation practices in slash-and-burn agriculture.

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One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.