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.
Partial gene map of the operons, such as trp and lac, on a bacterial chromosome. Image from Purves et al., , 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission. A segment of the DNA that codes for a specific polypeptide is known as a structural gene.