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!
*Each globin in hemoglobin contains one heme *Heme is a porphyrin molecule that contains iron *Each heme iron can bind one oxygen molecule (so each hemoglobin molecule can bind a maximum of 4 oxygen molecules *Iron gives RBC its red color.Each globin in hemoglobin contains one heme *Heme is a porphyrin molecule that contains iron *Each heme iron can bind one oxygen molecule (so each hemoglobin molecule can bind a maximum of 4 oxygen molecules *Iron gives RBC its red color.