The third one is the correct answer I hope this helped
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
Answer: Potassium-40 decays into argon gas over time.
Explanation: Potassium-argon dating is a dating method used to determine the age of sedimentary rocks by comparing the proportion of K-40 to Ar-40 in a sample of rock, and knowing the decay rate of K-40.
Potassium-40 undergoes decay following first order kinetics as given below:

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The songs will become more similar to each other.
<span>The frogs have most likely sync their songs with each other, since the female cannot determine the range of the song of the male frog given the environment that they are living in.</span>
"27 days, 7 hours, and 43 minutes for our Moon to complete one full orbit around Earth"