What does a culture medium provide to a living cell?
a. a slab of agar
b. oxygen-rich air
c. a constant temperature
d. food molecules called nutrients

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.