Persons with type O- blood are often referred to as the "universaldonors" based on the antiagens found on type O- blood cells and the antibodies found in potential recipients plasma explain why this is ture

The statement is true

Explanation:

Persons with type O- blood are often referred to as the "universaldonors" based on the presence of neither type A or B antigen on the red blood cell, coupled with anti-A and anti-B antibodies. Hence, since

the type O blood lacks antigens, it does not clump when mixed with any of the other blood types in the recipient plasma

Thus, the type O blood is a universal donor

d. planting trees

the trees take in carbon to make oxygen.