Scientists used mice to study whether exercise ability can improve in animals over several generations. In this experiment, mice were artificially selected
for increased wheel running behavior. The mice that were able to do the most wheel running were selected to breed the next generation. The control
group represents generations of mice that were allowed to breed randomly.
1. What patterns do you see in the data?

Essays are commonly used as literary criticism, political manifestos, learned arguments, observations of daily life, recollections, and reflections of the author. Almost all modern essays are written in prose, but works in verse have been dubbed essays (e.g., Alexander Pope's An Essay on Criticism and An Essay on Man). While brevity usually defines an essay, voluminous works like John Locke's An Essay Concerning Human Understanding and Thomas Malthus's An Essay on the Principle of Population are counterexamples.