Molecular clocks
a. take advantage of the fact that only neutral mutations do not happen at a steady rate.
b. take advantage of known mutation rates to estimate how long ago organisms shared a common ancestor.
c. take advantage of the fact that all mutations happen at a steady rate.
d. take advantage of the fact that all mutations affect the fitness of an organism.

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water