What chemical form must phosphorous and nitrogen have before they can be utilized by plants?
What will be an ideal response?
They are present as proteins and DNA in animal tissues that decay
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In a truly free-market economic system, all economic decisions are governed solely by principles of fairness, democracy, and individual choice.
Answer the following statement true (T) or false (F)
The most common minerals in the Earth's crust are the ________.
A. silicates B. sulfates C. sulfides D. halides E. carbonates
What is one piece of evidence that supports the Big Bang Theory?
A. The rotation and revolution of Earth B. The universe formed over 13 billion years ago C. The universe is cooling down D. A weak signal of cosmic microwave background radiation
The closer the dew point temperature is to the actual air temperature, the lower the relative humidity
a. True b. False Indicate whether the statement is true or false