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.
The term ' segmentation gene ' is a classification given to a broad class of genes that are further subdivided into three smaller classes of genes. Within the segmentation gene group, there are gap genes, pair-rule genes and segment polarity genes.They control development in this order.These segmentation genes control the development of segments, or small repeated regions of a body that make up specific structures. If you were to look at a fly embryo during development, you'd quickly notice these segments along their bodies.hey control development in this order. These segmentation genes control the development of segments, or small repeated regions of a body that make up specific structures. If you were to look at a fly embryo during development, you'd quickly notice these segments along their bodies.