The answer is B, because cells make up tissue, tissue makes up organs, organs make up the organ system, and an organ system makes up an organism. Imagine it as a process from least to greatest complexity.
As the race begins, all of your physiological support systems - the musculoskeletal, cardiovascular, respiratory, digestive, immune, nervous, ...
Different colored bands in each solvent signify the different materials that are found in the substance that is been analysed.
The green band in the solvent represent the green chlorophyll which are found in leaves. Chlorophyll is the substance which gives the plants the capacity to trap energy from the sun for production of food.
