<span>10%
Keep in mind the energy pyramid.
90% energy is lost at each level approximately.</span>
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: Darwin had stated in The Origin of Species that “all the organic beings which have ever lived on this Earth may be descended from some primordial form”,
Explanation:
5. System level
6. Organ level
<span>The answer to coprolites may contain fragments of undigested food, and thus provide valuable information about the feeding habits of fossil organisms is true. </span>
