Carbon dioxide is a pure substance. A pure substance can be an element or a compound. Carbon dioxide is a pure compound, consisting of two kinds of atoms that are bonded together. An element consists of merely one kind of atom. For example, oxygen is an element.
For Downâs syndrome, a blood test called the quadruple test is available from weeks 14-20 of pregnancy. For Patauâs and Edwardsâ syndromes, you will be offered a mid-pregnancy scan that checks for physical abnormalities.
Back Pain During Pregnancy: Causes, Treatment and Prevention. Back pain or discomfort is common during pregnancy and should be expected to some degree by most women. Back pain may be experienced during any point of your pregnancy; however, it most commonly occurs later in pregnancy as baby grows.Back pain can disrupt your daily routine or interfere with a good night of sleep.The good news is there are steps you can take to manage the back pain that you experience.ack pain may be experienced during any point of your pregnancy; however, it most commonly occurs later in pregnancy as baby grows. Back pain can disrupt your daily routine or interfere with a good night of sleep. The good news is there are steps you can take to manage the back pain that you experience.