The largest time unit in the geologic time scale is the
a. epoch. b. era. c. period. d. eon.

Which of the following birds remained ancient looking in the miocene epoch? a. crows b. owls c. grouses d. none of the above

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

If animal agriculture was eliminated, how much grain would become available for human consumption?