They do still exist and are mostly microscopic and consist of various types of bacteria. Two examples can be <span>Actinomyces </span><span>and Bacteroides, both obligate anaerobics, meaning that air actually harms them.</span>
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>Genes.Genes are the working unit of the hereditary character of DNA. Genes act as instructions usually coding for a particular protein or function. One form of gene which are called alleles <span>determines the traits that can be passed on from parents to offspring.</span></span>
Atoms, molecules, ORGANELLES, cells, ORGAN ,organ system, ORGANISM, population and community
ORGANELLES, ORGAN, ORGANISM.
