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the very cold zone in an ocean, dam or a lake, located below the range of effective light penetration (the limnetic zone).
the practice and science of classification. This is the part of systematics that is only...
epithelial tissue consisting of a single layer of cells.
movement of the Earth's continents as the Earth's tectonic plates shift.
the second biological classification group (taxon) that is divided into phyla (for animals) or...