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.
Is there anything I can do to ease cramps during pregnancy? Yes, there are steps you can take to ease cramps that are a normal pregnancy problem. Throughout your pregnancy the tough, flexible tissues (ligaments) that connect your bones will stretch. When you move around, this may cause mild cramps on one or both sides of your body.