Answer: It has been shown that it has helped many people who joined the program, and the schools programs has been gathering attention as a strategy for economic development. It's also improved academic scores for the people that joined and boosted their confidence to get better at reading.
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Explanation:
Answer:
The unknown radioactive element is present in pitchblende.
Explanation:
Marie Curie was the scientists that mainly worked on the radioactive element. She was the first scientist who won the noble prize in two different fields of science.
The pitchblende was the mineral sample that was noticed by Marie curie during her experiment. Pitchblende contains a more radioactive element that uranium and confirms that she had found a new element.The new element was polonium with hundred times more radioactive than uranium.
Thus, the answer is unknown radioactive element is present in pitchblende.
You are correct , it is D. hope it helps
