Taking care of the eyes throughout your lifetime will not only extend the ability to see clearly, but having regular eye exams is vital to ensure overall health. There are many diseases which are not of the eyes, but will exhibit symptoms which affect vision. Diabetes and hypertension are well-known for their relationship to the eyes, but other diseases, as well as medication, can cause eye-related issues.
In addition to nitrogen fixed by. Rhizobium bacteria, other natural. sources that contribute to the soil. nitrogen include: mineralization of. organic matter and nitrogen released. as plant residues are broken down in. the soil. Animal waste is a good source. of natural nitrogen as well. Barnyard or poultry manure and. other animal waste products (e.g., bat guano) were used as a source of. supplemental nitrogen long before. inorganic nitrogen fertilizer came into. popular use.
Photosynthesis from plants use carbon dioxide, sunlight, and water and a byproduct is oxygen. Before humans existed, the earth existed for millions of years creating an enormous supply of oxygen. Organisms and plants created a balance of oxygen and CO2. The Earth's net supply of oxygen comes from phytoplankton. Plants produce oxygen but use up what they make by producing carbon dioxide at night and when they are burned or decompose, so you see, the only thing that keeps us breathing is the tiny phytoplankton in the sea.