Overproduction of organic matter resulting in anoxic conditions is attributed to ________
A) autotrophication
B) eutrophication
C) net primary productivity
D) photoperiodicity
E) phototropism
B
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A neutral molecule, such as water, can form an ion when it
A. fragments into protons and electrons. B. absorbs electrons and become negatively charged. C. combines with a chloride ion to form a negatively charged species. D. combines with a hydrogen ion to form a positively charged species. E. absorbs electrons and become positively charged.
Which biome is home to more plant and animal species than any other?
A) evergreen forest B) grassland C) deciduous forest D) tropical rain forest E) savanna
Today, the less-developed countries have ________.
A. high death rates and low birthrates B. high death rates and high birthrates C. low death rates and high birthrates D. low death rates and low birthrates
Which element accounts for the largest percentage of the earth's crust?
A) carbon B) nitrogen C) oxygen D) silicon