Again, medication may be the reason your urine changes color. It could also mean there is blood in your urine, either from vigorous exercise or due to an infection. If you're urine doesn't clear up in 24 hours, go see a doctor.
The three-domain system is a way for classifying biological organisms. This classification system distinguishes between eukaryotic organisms, organisms which have cells which include a nucleus, and two types of prokaryotic organisms, organisms with cells which lack a nucleus.Over the years, scientists have developed several systems for the classification of organisms.he three-domain system is based on the traditional, and most accepted, six-kingdom system but divides the prokaryotae into two domains, leaving the remaining eukaryotic kingdoms in the third domain.
Woese argued that, on the basis of differences in 16S rRNA genes, these two groups and the eukaryotes each arose separately from an ancestor with poorly developed genetic machinery, often called a progenote. To reflect these primary lines of descent, he treated each as a domain, divided into several different kingdoms. Woese initially used the term kingdom to refer to the three primary phylogenic groupings, and this nomenclature was widely used until the term domains was adopted in 1990.