Answer:
Scandium and yttrium are considered rare earth elements since they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties. While named rare earths, they are in fact not that rare and are relatively abundant in the Earth's crust.
Explanation:
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Answer: Crops providing significant food supplies were exchanged. Some of the crops Europeans brought to the New World have become food source staples around the world. These crops include wheat, barley, soybeans, rice, and various leafy vegetables.
Explanation:
Answer:
practice effects
Explanation:
Based on the information provided within the question with regards to Leigh's experiment it can be said that her biggest concern should be practice effects. This term refers to the effects or changes that can occur when repeating the same experiment various times with the same participants. Which is what Leigh is doing, as she is only changing one variable but repeating the same experiment.
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