One problem with issuing a hurricane warning is:
A) no standardized system for issuing warnings exists on a federal level in the United States.
B) few people pay attention to warnings.
C) it is difficult to issue warnings with enough lead time for people to evacuate.
D) hurricane forecasts require large areas that will be unaffected to be included in the warning.
D
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The amount of biomass on successive trophic levels in a food chain forms a pyramid in which the biomass on trophic level N+1 is only 20% of the biomass on trophic level N. If pesticide P is transferred from one trophic level to the next with 100% efficiency, what will be the concentration of P on trophic level 5 if the concentration of P on trophic level 2 is 4 parts per million (ppm)?
a. 500 ppm b. 2500 ppm c. 20 ppm d.100 ppm
Which of the following can cause enzyme activity to either increase or decrease?
A) increasing the substrate concentration B) changing the pH C) both a and b D) neither a nor b
How does water have such strong surface tension?
a) Water molecules are constantly bumping against each other, creating strong surface tension. b) Water is the universal solvent, and so has extremely strong surface tension. c) Hydrogen bonds form between adjacent molecules due to water's polarity, thus giving it strong surface tension. d) Water has high kinetic energy, resulting in strong surface tension.
Which of the following lists the correct, generalized sequence of climates from the equator to the poles?
A) Tropical ? Dry ? Mesothermal ? Microthermal ? Highland B) Tropical ? Mesothermal ? Dry ? Microthermal ? Polar C) Tropical ? Dry ? Mesothermal ? Microthermal ? Polar D) Polar ? Microthermal ? Dry ? Mesothermal ? Tropical E) Dry ? Tropical ? Mesothermal ? Microthermal ? Polar