This is a difficult thing to try to measure because we can never be sure if what we are measuring is really representative of what is happening. We can measure genetic diversity, resiliency and vulnerability of a population. We can look at how much variation there is in the gene pool of a population, and if they have to adapt to changes, how quickly the variation allows a population to adapt to the conditions. This might have to be calculated in generations of the population. Gathering that data may take a long time. Generally, though, we don’t see evolution as it is happening. We can only see that it has happened, so the “rate” that we could estimate is not from a present tense perspective.
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