Answer:
Correlation indicates that the two numbers are related in some way.
Causation requires more proof that there is no lurking variable that creates the relationship.
Explanation:
This mechanism allows killer T-cells to hunt down and destroy cells that are infected with germs or that have become cancerous.
The other main type of T-cells are called helper T-cells.
Helper T-cells orchestrate an immune response and play important roles in all arms of immunity.
C. Direction
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