When writing a conclusion, to what should the writer always refer?

The body is protected against harmful flu viruses by

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

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.