Vehicle ownership by expats in Saudi. Public transport is almost negligible in Saudi Arabia. As an expatriate, it is really convenient if you have a car of your own. For those of you with your families, it is almost impossible to survive without a vehicle.
Phyla with a true coelom and digestive system are divided into two groups, the protostomes and the deuterostomes. As the hollow sphere of cells known as a blastula develops, an invagination produces an opening called the blastopore. In protostomes, the blastopore becomes the mouth.
â  The one gene: one enzyme hypothesis summarizes. the basis of modern genetics: that a gene is a stretch. of DNA coding for one or more isoforms of a single. polypeptide. â  Some genes do not encode polypeptides, but encode. structural or regulatory RNAs.