4. A scientist finds a rock with old microfossils in it, likely from around 4 billion years ago. Which radioactive isotope should the scientist use to determine the age of the sample and why? (
se fosse uma pedra com 4 bilhoes de anos qual isotopo deveria de usar e porque?)

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

What are the three types of counseling established by marine corps policy?