GEOLOGY

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EARTH SCIENCE

CLIMATE AND ENVIRONMENTAL CHANGE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Dead zones are low-oxygen areas that develop on the seafloor. Scientists hypothesize that phytoplankton blooms cause these dead zones. Phytoplankton blooms occur when excess nutrients are introduced by pollution from fertilizers, sewage plants, and the burning of fossil fuels. Which of the following would most likely cause an increase in these contributors to dead zones?
A
Rainfall patterns that increase freshwater runoff from terrestrial ecosystems
B
Replacing coal-fired power plants with windmills
C
Farming practices that reduce nitrate and phosphate applications
D
Constructing efficient water-recovery and treatment plants
Explanation: 

Detailed explanation-1: -Animals that eat both producers and consumers are called omnivores.

Detailed explanation-2: -The graph shows pink salmon populations in Prince William Sound from 1970 to 1999. What do these data suggest about the effect the oil spill had on pink salmon? Pink salmon were nearly eliminated after the oil spill.

Detailed explanation-3: -The eye that is most likely to belong to an animal that is active most of the day on white desert sand is the eye labelled J. The iris of eyes of animals in the desert is modified; for example the camels have three eyelids, to protect their eyes from sand blowing in the desert environment.

Detailed explanation-4: -Secondary consumers receive 10% of the energy available at the primary consumer level (1% of the original energy).

There is 1 question to complete.
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