Bacteria break down organic matter and return carbon dioxide and water to the environment. This is an example of a. combustion. c. nitrogen fixation. b. transpiration. d. decomposition. Please select the best answer from the choices provided A B C D

An adult inhales about 6.0×10−4 m3 of fresh air during a breath. only 20% of fresh air is oxygen. assume the pressure in the lungs is 1.0×105 paand the air is at a temperature of 300 k. how many oxygen molecules are in each breath? a. 1.4x10^23 b. 2.9x10^21 c. 4.9x10^-4 d. 2.9 x10^25