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.
Carbon. If you separate a living organism into its molecular parts, you will find about 70% water. The remainder of each organism is composed of organic molecules, which are necessary for life on Earth. Covalent bonds between carbon and hydrogen atoms form the basis of organic molecules.Other elements such as oxygen, nitrogen, and phosphorus play key roles in life processes by modifying the structure and chemical properties of organic molecules.he unique number and arrangement of bonds between carbon atoms creates a structurally diverse set of organic molecules in nature. These molecules may be constructed in straight, branched, or ringed carbon chains and may include varying numbers of carbon-carbon single, double, or triple bonds.