Can the existing avian influenza virus be transferred from one human host to another? Why or why not?

Hello, As long as the bird flu virus doesn't change into a human flu virus, it won't spread far in people. But sometimes after close personal contact a person who gets bird flu does infect another person. They can get the virus from tainted surfaces, such as cages and other farming equipment. Most people with the virus have had direct contact with infected poultry or objects contaminated with bird feces or secretions. Until now, very few cases of human-to-human transmission have occurred. Hope That Helps!

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."    

not only is it colder, it also becomes darker, less salty, and more dense.