the atmospheric concentration of carbon dioxide increased from 278 ppm in 1790 to 383 ppm in 2007. what is the approximate percent increase in carbon dioxide concentration from 1790 to 2007?

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

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

not sure if this what   you'r looking for would be percent composition