What is the principal cause of cultural eutrophication?
A) heavy metals in treated municipal water
B) elevated biochemical oxygen demand
C) elevated levels of fecal coliform bacteria
D) elevated levels of phosphorus and nitrogen
D
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Define sectoral transformation and then discuss its manifestation in North America. Please be certain to give an example of each of the four sectors.
What will be an ideal response?
When do tidal currents reach their maximum velocity?
A) Midway between slack water and high tide B) During the period of slack water C) Midway between high and low tide D) Midway between low tide and slack water
Explain how Eratosthenes used the rays of the Sun to estimate the circumference of Earth and to demonstrate that the planet was spherical
An increase in manufacturing was one of the early impacts of NAFTA in Mexico. However, Mexican farmers were particularly unhappy about having to compete with American farmers
Indicate whether the statement is true or false