Dont worry those are just variables. a. and b. is the same as 1 and 2 !
<span>The geologic time scale is divided into periods, which are then divided into epochs, which are further divided into ages. For example, the time of the dinosaurs lasted 3 periods (Triassic, Jurassic, Cretaceous), each period had 3 epochs (late, early, middle), and each age fit into one of those. Many epochs have more than 1 age associated with them.
As for the basis for differentiating the eras, I'm not so sure. The only one I can say for sure is the end of the Cretaceous, which is when the dinosaurs suddenly became extinct due to a meteor impact. I think the divisions are based on significant, global-scale events that changed the world.
Sorry its so long but that the answer i think >:) ur welcome
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Well obviously if all the water drains out they will all die.
C. The species will become extinct.
Hope this helps.
<span>The female is born with about one million immature sex cells.</span>
Cells undergo mitosis because there must be a process in which the nucleus is divided in order for there to be a successful reproduction for cells.