At iwis you will find the right connecting link for every roller chain: Outer link, Inner link, Spring connecting link, Connecting link cotter pin type, Single crank link, Double crank link. An intermediate or transitional condition is a connecting link between two taxonomic classes of organisms. A connecting link has characters that are common to both groups of organisms.
Connecting link is an organism having characteristics of two different group of organisms e.g, duck-billed platypus ( scientific name Ornithorhynchus anatinus) is a connecting link between reptiles and mammals i.e, it has mammary glands to feed its young ones like other mammals e.g human being, cow, buffalo. Some well-known examples for connecting links are Archaeopteryx, Duck-billed platypus, Lungfish, Seymouria, Balanaglossus, Peripatus.
Connecting links provide the evidence for the path of evolution and lie midway between the two groups that is they have features of both the groups of organisms. These confirm evolution of amphibians from fishes; mammals from reptiles ; arthropods and molluscs from the annelids. Connecting links in the line of evolution refer to living organisms which share the characteristics of two different groups and bridge the gap between these two evolutionary groups. An example of a living organism which acts as a connecting link, would be Euglena.
