The use of DDT is banned worldwide.
Answer the following statement true (T) or false (F)
False
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_______ organisms make their own nutrients. Fill in the blank(s) with the appropriate word(s)
What is the most accurate description of the principle of a lightning rod?
A) The lightning rod acts to discharge the thunderstorm. B) The lightning rod intercepts the lightning and safely carries the lightning current around the object it protects. C) Lightning rods have been used since the 1700s, but the principle of their operation is not known. D) A positive charge induced in the lightning rod repels the negative charge in an approaching step leader.
Slopes in flatter areas are
A. cliffs. B. elevated. C. gentle. D. indexes.
The presence of free oxygen in the atmosphere is attributed mainly to which of the following?
A. volcanic activity B. development of blue-green algae C. formation of the outer core D. formation of the inner core