What hampered belief in the theory that species change over time?

In the_ work-study program, college students who have financial needs can work part-time jobs to pay for education expenses. a stafford b university c federal d pell

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome

The difference between the observed value and the mean of the set of values is a