Which of the following statements is incorrect about how the components of hemoglobin are recycled?
a. hemoglobin can be recycled only if phagocytized by macrophages.
b. each heme is stripped of its iron and converted to bilirubin, then excreted in bile.
c. the alpha and beta chains are released into the bloodstream for use by other cells.
d. iron ions are either stored in a phagocytic cell or circulate in the blood, bound to transferrin (a plasma protein).

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !