Who first discovered the phenomenon of radioactivity? Who first used the term “radioactivity”?

What did Ernest Rutherford find?

Marie Curie first used the term radioactivity. Ernest Rutherford discovered 2 types of radiation, alpha and beta particles, coming from uranium.

Explanation:

How this was helpful! :)

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )