What are the major natural sources of potassium used by plants?
A) It is extracted from rocks.
B) It is formed by atmospheric reaction of potassium and oxygen during lightning strikes.
C) It is extracted from seawater by specialized bacteria in phytoplankton.
D) all of the above
E) only A and B
Correct Answer:
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Q17: Humans are _.
A)primary consumers
B)secondary consumers
C)tertiary consumers
D)all of
Q18: Which of the following would not illustrate
Q19: Anything that eats a producer is called
Q20: Which of the following is not a
Q21: Which element besides carbon, hydrogen and oxygen
Q23: Even though a plant will often have
Q24: Which of the following statements is true?
A)Plants
Q25: Which of the following forms of nitrogen
Q26: What would happen to a forest without
Q27: A low soil pH _.
A)helps the soil
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