Leg Pain Symptoms & Signs. Related. Symptoms & Signs. Pain in the legs can occur as a result of conditions that affect bones, joints, muscles, tendons, ligaments, blood vessels, nerves, or skin. Leg pain can occur in the foot, ankle, knee, behind the knee, thigh, down the back of the leg, or in any part of the leg.
Taxonomy is the science of classifying and defining all organisms. This comes from Ancient Greek taxis (meaning arrangement) and nomia (meaning method). The way taxonomy goes is: domain #-># kingdom #-># phylum #-># class #-># order #-># family #-># genus #-># species.
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.