Domain' is the highest rank and 'kingdom' is the second highest rank in the sequence of classification. Classification groupings have evolved over time in light of new scientific findings.

Unlike anything previously classified, these organisms don't fit within the plant, animal, or any other known kingdom. The discovery sheds light on an ancient lineage and brings forth clues about ...

It grouped all species into higher categories, known as taxa: genera, orders, classes and kingdoms. Central to this system was binomial nomenclature – the idea that all organisms should be ...