The presence of coliform bacteria in a source of drinking water indicates
A. that it has been contaminated with human or animal waste.
B. that it has a high biochemical oxygen demand.
C. that it contains toxic materials.
D. All of these are correct statements.
Answer: A
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The difference between active and passive remote sensing systems is that
A) active systems involve the latest generation of satellites while passive systems use signals from older satellites. B) active systems include aerial photography while passive systems rely on satellite imagery. C) active systems can operate throughout cloud or fog cover while passive systems require clear sky conditions. D) active systems emit their own energy while passive systems simply detect existing energy signals.
Human wisdom teeth are examples of ____ since their functionality has changed over time
a. homologous structures b. analogous structures c. vestigial structures d. extra appendage e. superfluous organs
Which air mass is the driest?
A) mP B) mT C) cT D) cA
Your uncle works for the Central Arizona Project. Levels of which of the following rivers will be of his highest concern?
a. Colorado River b. Missouri River c. Salmon River d. Mississippi River