I believe the answer is c)
A. <span>Pollution made in one country might contaminate the ground, water, and air of other countries.</span>
Answer:
Shape of Red Blood Cells Erythrocytes are biconcave discs with very shallow centers. This shape optimizes the ratio of surface area to volume, facilitating gas exchange. It also enables them to fold up as they move through narrow blood vessels.
Ice because it releaves the precer that the needle has put in it.
