Explain how the open sea can be both an area of low average primary productivity and the largest contributor to the earth's overall net primary productivity.
What will be an ideal response?
?Average NPP and per unit NPP are low, but the size of the ocean means it contributes a very large amount of the earth's overall NPP. In addition, the NPP can be much higher in certain areas because of upwellings that bring nutrients from the depths to the surface. These nutrients are used by producers to increase the NPP.
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Which section of the Emergency Response Guidebook (ERG) contains the guides?
a. Orange b. Blue c. Yellow d. Green
Earth's solid portion composed of rocks and the sediments overlying them is the
A) atmosphere. B) hydrosphere. C) lithosphere. D) biosphere.
Biodiversity enhances human food security because it ________
A) decreases the number of predators B) means that there is genetic uniformity C) is a potential source of new food items or new genetic varieties of existing foods D) reduces the number of pollinators available to any one plant species E) increases the number of available pathogens
Which pollutant is formed during the incomplete combustion of carbon-containing fuels?
A) sulfur dioxide (SO2 ) B) carbon monoxide (CO) C) carbon dioxide (CO2 ) D) volatile organic compounds (VOCs)