List the current typical US diet concerns regarding nutrients and food groups. Explain how the dietary guidelines for Americans work as part of an overall US dietary guidance system.

answer; polycythemia is the correct answer;

make   gliitsh plesea   !

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.