She would find oxygen (O2) in the test tube because plants give off oxygen
Answer:
Boiling point is the temperature at which a substance changes from liquid → gas. Scientists determine melting or boiling point by heating a small sample of the substance, keeping careful track of the temperature the entire time. When they see a solid melt, they record the temperature as the melting point.
If the demand for copper increases but the supply remains the same then the price of copper will increase because the amount of people buying it have increased, but because the suppliers are at a constant rate of production it costs more to get the copper, and so it costs more for the suppliers to buy the copper. So in order for the suppliers to break even they have to increase the price of the copper or risk losing the money. So your answer is D.
Pairing a stimulus with a conditioned response- Classical Conditioning
hope that’s ok