Naked mole rats have several morphological as well as behavioral adaptations which allow them to live in a eusocial system within a harsh and unforgiving environment How would an evolutionary biologist explain how these unique characteristics evolved from ancestors who did not possess these traits? (Note: The term eusocial as defined by Krebs and Davies (1993) includes animals that exhibit: 1) cooperative care of the young; 2) a reproductive division of labor - that is, some castes or classes are less fecund or sterile; 3) overlap of at least two generations; that is, the offspring assist the parents during some period of their life.)

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.