How does the author support the claim that artificial blood would solve problems posed by human blood? by showing how bioengineers are developing blood substitutes based on different animal species B. by describing how artificial blood can be easily transported, stored, and matched with any blood type C by emphasizing how artificial blood substitutes do not need to perform all of the functions of real blood D by explaining how scientists are working to prevent hemoglobin from breaking down and having a toxic effect on the body