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Sagot :
Answer:
a his immune system does not work the way it used to
Explanation:
As Joe is having frequent illness, it seems that his immune system does not work the way it used to. The correct option is A.
What is immune system?
The immune system defends ones body against external intruders. This would incorporate germs such as bacteria, viruses, and fungi, as well as toxins produced by microbes.
The immune system is made up of various organs, cells, and proteins that collaborate.
Smoking, alcohol, and poor nutrition along with age can all weaken your immune system.
AIDS, HIV is an acquired viral infection that devastates important white blood cells and weakens the immune response, resulting in AIDS. HIV/AIDS patients can become seriously ill from infections that most people can fight off.
As the Joe is 75, and is grandfather, his immune system becomes weak comparatively as age is one of the various factors that can affect a person's immune system.
Thus, the correct option is A.
For more details regarding immune system, visit:
https://brainly.com/question/15660598
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