The Earth reaches its perihelion (the point in its orbit when it is closest to the sun) during the month of January (around January 3rd currently), which falls durin â¦ g the season of winter in the northern hemisphere.
State that the most frequently occurring chemical elements in living things are carbon, hydrogen, oxygen and nitrogen. State that a variety of other elements are needed by living organisms, including sulphur, calcium , phosphorus, iron and sodium. State one role for each of the elements mentioned above. 1  Nitrogen: Required by proteins. 2  Calcium: The mineral that strengthens bone and teeth uses calcium. 3  Phosphorus: Part of the phosphate groups in ATP and DNA molecules.  Iron: found in the structure of hemoglobin and essential for the production of red blood cells.
The chemical properties of the ocean are important to understand because the marine environment supports the greatest abundance of life on earth. This life is largely made up of the same chemicals that comprise the oceanâwater and salts. Water. A water molecule is made up of two hydrogen atoms joined to one oxygen atom by weak hydrogen bonds, H 2 O.