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.
Unfortunately, during pregnancy it is more difficult to accomplish because of all the changes your breasts are going through. Your breasts are growing in size, are tender, and sometimes may even be lumpy. It is still important for you to examine your breasts during pregnancy every 4-5 weeks.Very common lumps found among women during pregnancy are clogged milk ducts. These are red, tender-to-the-touch, hard lumps in your breasts.here are a number of breasts changes during pregnancy that you should expect. These pregnancy related breast changes include the following: 1  Growth and enlargement. 2  Tenderness and hypersensitivity. 3  Darkening of nipples and areolas (the skin around your nipples) due to hormones that affect pigmentation of the skin.