Answer:
The Immune system is a complex network of cells (such as lymphocytes) and organs that work together to defend the body against foreign substances (antigens) such as bacteria, a virus or tumor cell.
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Answer: D) changes in schooling
Explanation: Changes in schooling does not necessarily have to change the parent-adolescent relationship.
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The answer is B because a virus would be more effective
Answer:
Explanation:
Because it helps you in running condition and can help you have more condition