Which property of argon makes it useful for potassium-argon dating? It decays into potassium.
It is an unstable element.
It remains trapped in rock.
It is useful only for dating newer rock.

What mistake did john needham make that caused him to conclude that spontaneous generation for microorganisms occurred? a. he re-contaminated his boiled broth solutions. b. he destroyed the vital force in the solutions. c. he did not boil his broth solutions, only warmed them. d. he failed to seal his flasks of boiled broth. e. he allowed his assistant to conduct the experiment which he did not monitor closely.