1 If living in an area with frequent thunderstorms, consider buying a lightning protector. 2  These cost between $35 and $55. 3  Keep in mind that an invisible fence doesn't keep other dogs, animals or people out of the yard. If living in an area with frequent thunderstorms, consider buying a lightning protector. 2  These cost between $35 and $55. 3  Keep in mind that an invisible fence doesn't keep other dogs, animals or people out of the yard.
Carbon is essential for the survival, growth and reproduction of living things. It is a finite resource that comes in different forms and transfers from living to non-living things in various ways. Carbon stays balanced with other chemical reactions in the air and bodies of water through the carbon cycle.
Carbon is the sixth element listed on the Periodic Table of the Elements. Represented by the symbol C, carbon is the single most important element to the existence of life as we know it. Carbon is present in every living thing on Earth and is the second most abundant element found in humans. Carbon possesses a number of special chemical and physical properties that make it unusually suitable for the formation of complex compounds necessary for life. Structure A stable carbon atom possesses six protons, six neutrons and six electrons, resulting in an atomic mass of 12.011 and the sixth position on the Periodic Table of the Elements.