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.
Depression during pregnancy, or antepartum depression, is a mood disorder just like clinical depression. Mood disorders are biological illnesses that involve changes in brain chemistry. During pregnancy, hormone changes can affect the chemicals in your brain, which are directly related to depression and anxiety. These can be exacerbated by difficult life situations, which can result in depression during pregnancy.