Leukemia can be treated using human stem cells to attack and destroy cancer cells.
Plant Root and Shoot System. Plants have two Organ Systems: the shoot system and the root system. Stems have many jobs, including supporting the plant; acting like the plant's plumbing system, conducting water and nutrients from the roots and food in the form of sugar (glucose) made in the leaves to other plant parts.
Before - question, research, hypothesis, experiment, conclusions
Answer:
B. they bring cold , polar winds to the equator
