Blood is vital for transporting substances through the body. When a person bleeds, that person is hemorrhaging. Blood loss over 30% can be fatal if not replaced by a blood transfusion. A. A person with type AB- blood could receive type B- blood, type A- blood, type AB- blood, or type O- blood.
B. A person with type O+ blood could receive type O+ blood or type O- blood.
C. A person with type A- blood could receive type A- blood or type O- blood.
D. A person with type B+ blood could receive type B+ blood, type B- blood, type O- blood, or type O+ blood.

A and C

Explanation:

The signs for blood (positive or negative) from the donor always has to match the blood for the patient.

Type A- blood can only donate to A- blood or AB- blood.

Type B- blood can only donate to B- blood or AB- blood.

Type AB- blood can only donate to AB- blood.

Type O- blood can only donate to O- blood, AB- blood, A- blood, or B- blood.

Type A+ blood can only donate to A+ blood or AB+ blood.

Type B+ blood can only donate to B+ blood or AB+ blood.

Type AB+ blood can only donate to AB+ blood.

Type O+ blood can only donate to O+ blood, AB+ blood, A+ blood, or B+ blood.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.