What are two central ideas of the text? A
There is a widespread need for an artificial blood substitute.
B
Developing safe and reliable alternatives for human blood is challenging.
С
An essential function of blood is to transport oxygen throughout the body.
D
Scientists are struggling to evaluate the effectiveness of using artificial blood for
transfusions.
E
A hemoglobin-based oxygen carrier has been approved to treat patients needing blood
transfusions in South Africa.
F
The lack of advancement in medical technology prevents doctors from treating patient
in need when blood transfusions are not possible.