Can you answer number 33 please

How does natural selection change thephenotypes within a population over time?

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?

How did alexander fleming’s research solve a societal problem? he developed ways to treat inherited diseases. he advocated for regular hand washing to kill germs. he discovered a new type of medicine that could treat infections. he discovered the cause of mad cow disease, an emerging disease.