In subarctic saltmarshes, the addition of phosphorus has no effect on productivity but additional nitrogen will increase productivity. In this example, nitrogen is a
A. stimulant of evapotranspiration.
B. precursor to phosphorus.
C. biomagnifying factor.
D. limiting factor.
E. lipid solvent.
D. limiting factor.
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An urban environment may impact all of the following changes to a forest EXCEPT
a. amount of rainfall. b. rate of photosynthesis. c. rate of cellular respiration. d. seedling size. e. stomatal densities.
The earliest type of eukaryotic organism currently known is a type of ____
a. virus b. bacterium c. alga d. animal-like protist e. fungus
Explain why male lions, after they have entered a new pride of female lions, will often engage in the practice of infanticide
What will be an ideal response?
Phytoremediation is ____
a. rotating crops so that soil minerals are replenished b. replacing eroded topsoil so that plants can grow in the soil again c. plowing under all or parts of crops to improve the soil d. the use of plants to remove pollutants from the environment e. replacing unwanted plants with plants useful to humans