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:

Gland cells are most likely to possess a large number of Golgi bodies.
Please mark my answer as the brainliest answer, I'd really appreciate it, thanks!
Electron microscopy would be most useful in observing the structure of a virus