The correct answer is ''consists of protoporphyrin and an iron (II) ion.''
Explanation:
The heme group makes up the prosthetic (non-protein) group of hemoglobin and is responsible for its characteristic red color. It is composed of protoporphyrin IX, in the center of which is the ferrous ion (Fe+2). Protoporphyrin IX, in turn, is composed of four pyrrolic rings. The heme group is synthesized by the mitochondria, where protoporphyrin IX binds with the ferrous ion, before being released into the cytoplasm. The heme group is released in erythrocyte lysis, thus obtaining unconjugated or indirect bilirubin.
Lets say the plant that formed nodules is Species A, and the one who didn't is Species B.
If the nitrogen is concentrated in one area but at a low concentration, then Species A may have formed nodules because it is closer to the concentrated nitrogen. Species B didn't because the nitrogen that is active is being taken by Species A.
<span>There are different types of epithelium cells that make up the skin, the outermost layer consists of dead stratified squamous. The skin in your mouth and esophagus are also stratified squamous cells but these are not keratinized.</span>
As a majority of soils in tropics are of the Alfisols and the Ultisols. These soils are old and have lower fertility, but due to the presence of the dry season, the nutrients can stay in place. In the tropical rain forest, most of the time have sufficient rains but the soil lacks organic matter as they fast decomposition processes.
