Phenology The science of appearances through and attempt to understand nature’s “clocks and calendars.” Today, it has taken on a meaning that links biological events and seasonal weather changes. These events include the hibernation of animals, the sprouting and flowering of plants, changing of leaf color, and the migration of birds. Phenols A group of organic compounds that in very low concentrations produce a taste and odor problem in water and which in higher concentrations are toxic to aquatic life. They are byproducts of petroleum refining, tanning, and textile, dye, and resin manufacturing processes.
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