PLEASE ANSWER ASAP

Now that he's 75, years old grandpa Joe seems to catch every cold or stomach virus that goes around. Which of the following is the best explanation for this?

A.) His immune system does not work the way it used to.

B.) He is less able to absorb some important nutrients.

C.) His kidneys are less efficient at filtering waste.

D.) His genes make him prone to illness.

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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