To be a useful index fossil, the organism should have been rare when it lived on earth.

true

false

When new rock is added to an oceanic ridge, the magnetized strips on either side of the ridge are evidence of sea-floor spreading. this is because the rocks on the two sides of the ridge o are equal in width and in polarity are polar opposites oare magnetized vary in width but are equal in polarity

In figure 1-2 what is the distance from point b to point c?

If the selected review was submitted in word format, what are the posterior probabilities of it being short, medium, or long? (round your answers to three decimal places.)