Answer:
The answer is the Immune system (a).
Explanation:
The immune system consists of agents that help your body fight against pathogens and other invading substances. It has your white blood cells, enzymes, mucus, hydrochloric acid (in your stomach), and even your saliva. All these substances help make sure your body is rid of anything that may bring harm to you!
D. A consumer buys or trades to receive a commodity available for sale or exchange
One of the major things it helps with is decreasing stress and getting oxygen flowing through your body
1. Normal
2. Excessive
3. Normal
4. Normal
5. Excessive
If it causes you to loose sleep and not do the things you used to or makes you feels sleep then it is excessive but if you feel fine after you do the task the anxiety is about it is completely normal.