Which cell type, molecule, or process listed below does not have a function or rolein both the innate and adaptive immune systems?

These mechanisms together with phagocytosis, antimicrobial peptides called defensins, and the complement system. Jawed vertebrates, including humans, have even more unusual defense mechanisms, including the ability to adapt over time to recognize specific pathogens more efficiently. This process was got by  immunity is the basis of vaccination. 

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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."