QuestionMay 4, 2026

19. The process by which atomic nuclei spontaneously decay is called relative dating radioactivity erosion deposition 20. The time it takes for 50 percent of the nuclei in a radioactive sample to decay to its stable isotope is called the daughter product geologic time the half-life the half-time 21. The scientist who developed the theory of evolution was Harry Hess James Hutton Charles Darwin William Smith

19. The process by which atomic nuclei spontaneously decay is called relative dating radioactivity erosion deposition 20. The time it takes for 50 percent of the nuclei in a radioactive sample to decay to its stable isotope is called the daughter product geologic time the half-life the half-time 21. The scientist who developed the theory of evolution was Harry Hess James Hutton Charles Darwin William Smith
19. The process by which atomic nuclei spontaneously decay is called relative dating radioactivity erosion deposition 20. The time it takes for 50 percent of the nuclei in a radioactive sample to decay to its stable isotope is called the daughter product geologic time the half-life the half-time 21. The scientist who developed the theory of evolution was Harry Hess James Hutton Charles Darwin William Smith

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Answer

19: radioactivity ### 20: the half-life ### 21: Charles Darwin Explanation 1. Identify correct term for spontaneous nuclear decay Spontaneous decay of atomic nuclei is called **radioactivity**. 2. Identify correct term for time it takes for half of radioactive nuclei to decay This is known as **the half-life**. 3. Identify scientist who developed theory of evolution The scientist is **Charles Darwin**.

Explanation

1. Identify correct term for spontaneous nuclear decay <br /> Spontaneous decay of atomic nuclei is called **radioactivity**. <br />2. Identify correct term for time it takes for half of radioactive nuclei to decay <br /> This is known as **the half-life**. <br />3. Identify scientist who developed theory of evolution <br /> The scientist is **Charles Darwin**.
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