Adding untreated sewage to a freshwater lake would cause the biochemical oxygen demand to
A) increase.
B) decrease.
C) stay the same.
D) The answer cannot be determined based on the information provided.
A
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Which of the following is true of the myelin sheath?
a. It is produced by glial cells b. It increases the speed of signal conduction along the axon c. It saves energy d. All of the above
Which type of mutation is most likely to result in lethality?
A) inversion B) duplication C) deletion D) translocation
Sequential hermaphroditism among coral reef fish in which an individual is first female, then male is called ________.
Fill in the blank(s) with the appropriate word(s).
Even in the absence of transpiration, some water can move into the roots and partially up the xylem columns. This phenomenon is due to
A. flooding. B. stomatal opening. C. root pressure. D. proton pumps. E. phloem translocation.