The blood in the pulmonary artery is going to the heart to collect oxygen, and therefore has a low content of oxygen. So, the blood in the pulmonary artery is a violet colour because it has low oxygen. The blood in the pulmonary vein is oxygen rich, and so it gives a scarlet color.
Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released by people burning fossil fuels.
The protest that is present in
toothpaste belongs to the phylum Chrysophytes species Diatoms. It has a
flexible cell membrane which is made of silica. This will help them keep their
cells shape, provides protection and helps keep water in its body.
