14 Apr 2012. Home INR monitors are simple to use and provide accurate results. You don't need any medical experience or technology skills to perform the simple INR test. The listed monitors are all approved for professional and home use allowing you immediate INR test values resulting in improved care.
Lampreys and hagfishes are the only jawless vertebrates to survive today. They both have a round mouth and for this reason are often referred to as cyclostomes. They are the most primitive of the vertebrates. By primitive, a biologist means that they are the least changed from the first vertebrates.1  They have no paired pectoral (shoulder) or pelvic (hip) fins. 2  Their notochord persists for life, never being completely replaced by a backbone even in the lampreys.3  They have no scales.y primitive, a biologist means that they are the least changed from the first vertebrates. 1  They have no paired pectoral (shoulder) or pelvic (hip) fins. 2  Their notochord persists for life, never being completely replaced by a backbone even in the lampreys. 3  They have no scales.
Even hydras, which are primitive, radially symmetrical cnidarians, show some degree of cephalization. They have a âheadâ where their mouth, photoreceptive cells, and a concentration of neural cells are located. Flatworms (phylum Platyhelminthes) are the most primitive animals with bilateral symmetry.They also have a fairly advanced degree of cephalization, with sense organs (photosensory and chemosensory cells) and a brain concentrated at the anterior end.his process eventually produces a head region with sensory organs. Cephalization is intrinsically connected with a change in symmetry. It accompanied the move to bilateral symmetry made in flatworms, with ocelli and pinnae placed in the head region.