The last 50 years of declining productivity of the commercial fish populations off the northeast coast of North America reveal the impact of
A) air pollution on fish populations.
B) water pollution from sewage and fertilizers on fish populations.
C) global climate change on fish populations.
D) overfishing.
D
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______ - the tidal mouths of rivers
Fill in the blank(s) with correct word
Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O2 ? 2 Fe2O3 What is happening at the anodic region?
A) Iron is being oxidized. B) Oxygen is being oxidized. C) Oxygen is being reduced. D) Iron is being reduced. E) none of the above
Tides caused by the inertia and the gravitational force of the sun and moon are called ____
A) neap tides B) astronomical tides C) tidal surge D) meteorological tides
Field experiments studying the effects of increased CO2 on forest growth have shown ________
A) decreased net primary productivity B) increased net primary productivity only when nitrogen and water are abundant C) there is no real effect on net primary productivity D) increased net primary productivity only when phosphorus and iron are abundant E) increased net primary productivity under all circumstances