Which of the following is a true statement concerning energy flow in ecosystems?
a. The biomass usually increases with each successive trophic level.
b. There is energy loss within each successive trophic level.
c. There is an increase in energy when an organism at one trophic level feeds on another.
d. The greatest amount of energy and biomass is concentrated at the heterotroph level.
B
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The balanced equation 3 H2(g) + N2(g) ? 2 NH3(g) means which of the following?
A) Three grams of hydrogen react with one gram of nitrogen to form two grams of ammonia. B) Three moles of hydrogen react with one mole of nitrogen to form two moles of ammonia. C) The equation means both a and b. D) The equation means neither a nor b.
An aquifer bounded above and below by impermeable layers of rock and clay is called a(n)
A) spring. B) unconfined aquifer. C) confined aquifer. D) water table. E) artesian well.
What is a microburst? Why do microbursts represent a hazard to aviation??
What will be the ideal response?
What is atmospheric stagnation and when might it occur?
What will be the ideal response?