Some isotopes, however, decay slowly, and several of these are used as geologic clocks. Dating rocks by these radioactive timekeepers is simple in theory, but the laboratory procedures are complex. <span>All methods rely on the fact that certain elements (particularly uranium and potassium) contain a number of different isotopes whose half-life is exactly known and therefore the relative concentrations of these isotopes within a rock or mineral can measure the age.</span>
Answer:
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Solar planet in an undiscovered solar planet. With no other living organisms at its surroundings.
The right answer for the question that is being asked and shown above is that: "e) they have cell with single flagellum at some stage of life" fungal and many protists cells have in common with animal cells that might make disease treatment more challenging is that <span>they have cell with single flagellum at some stage of life</span>
