The body of each organism is organized in a certain manner. Which of the following shows the organization of the body from the simplest level to the most complex level?
A.
organism --> organ system --> organ --> tissue --> cell
B.
cell --> tissue --> organ --> organ system --> organism
C.
organ --> tissue --> cell --> organ system --> organism
D.
tissue --> cell --> organ system --> organ --> organism

The chemical composition of soil varies with depth. an article in communications in soil science and plant analysis describes chemical analyses of soil taken from a farm in western australia. fifty specimens were each taken at depths 50 and 250 cm. at a depth of 50 cm, the average no3 concentration (in mg/l) was 88.5 with a standard deviation of 49.4. at a depth of 250 cm, the average concentration was 110.6 with a standard deviation of 51.5. find a 95% confidence interval for the difference in no3 concentrations at the two depths.