Not all spider bites are bad, in fact, most are not, but there are a few spiders that when they bite, they do incredible damage like the brown recluse below!pider Identification. Spiders can be found living in almost every habitat on earth. The only place that spiders are not found is only the harshest environments on Earth, the North and South poles, the highest mountains and the ocean. Some spiders have been found near the ocean, living in coral near the ocean edge.
A milliliter of blood contains about 5 billion red blood cells, each of which is packed with about 300 million hemoglobin molecules! A milliliter of blood contains about 5 billion red blood cells, each of which is packed with about 300 million hemoglobin molecules!
Hemoglobin. Every red blood cell in your blood is a vehicle for oxygen transport and contains about 250 to 270 million molecules of hemoglobin. The hemoglobin molecule itself consists of a protein component called globin, which is composed of four polypeptide chains. heme group at the end of each polypeptide chain contains an iron atom, which binds with oxygen and transports it throughout the body. Oxygenated hemoglobin molecules in red blood cells give blood its bright red color.