Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease occurs when the cells in your body are damaged as a result of infection and signs and symptoms of an illness appear. Pathogenic microbes challenge the immune system in many ways.The adaptive immune system ( antigens) reacts specifically to pathogens (germs). It is able to recognize attacking pathogens and fights against certain antigens or foreign substances. The next time a known antigen is encountered, the adaptive immune system can respond faster.
The answer is D. I took the test and I promise it is right. Don't believe me, check with a teacher! I KNOW that I am right. I have done this question so many times.
Option b is right that In order for a female offspring to be a hemophiliac, her father must be a hemophiliac.
