A process in nature in which organisms possessing certain genotypic characteristics that make them better adjusted to an environment tend to survive, reproduce, increase in number or frequency, and therefore, are able to transmit and perpetuate their essential genotypic qualities to succeeding generations.
A watchglass can be used as a beaker cover, but you can also place small amounts of chemicals on it and then heat it (for example, to evaporate some water from a wet chemical). From Wikipedia: A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. The latter use is generally applied to prevent dust or other particles entering the beaker; the watch glass does not completely seal the beaker, and so gas exchanges still occur.
Based on those observations, you will know the right approach on the right watch to wear. 6. They Wear the Right Watch for the Right Occasion. You may have multiple watches for different purposes. Marathon runners, swimmers and other athletes often wear water proof watches that can take punishment and continue to function. If you are going to attend an evening event with other professionals, it makes sense to wear a dress watch. 7. They Know How to Adapt. There are some industries that do not care much about watches. In Silicon Valley and the California tech industry, it is common to wear a simple watch like the Timex or the Citizen.