The pathway labeled B in the figure above is called a. alcoholic fermentation c. glycolysis

b. lactic acid fermentation d. cellular respiration

segmentation=endoskeleton=backbone=coelom=tissues

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.