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.
I&#39;m reading about synapsis and tetrads in Prophase I, and in the picture it has two sister chromatids, and I don&#39;t understand how there are 4 total chromosomes, so that when in Anaphase, splitting occurs in meiosis, each new cell has one chromosome from each homologous pair.