Answer:
the best one is to wash your hands. you can also not touch your face as much. this will help stop the spread of germs.
The gene pool of the population will remain relatively constant.
After a certain period of time, diseases and other sicknesses evolve along with humans, making the antibiotics nearly or completely ineffective. For example, if you took one tylenol when you have a cold, it may not be as effective the next day or so and would need to double the dose. Obviously it will all depend on the illness, and what stage it is in, and the strength of the medication. Also, at one point a vaccine for rabies might need an advanced formula because it might have evolved in animals. The possibilities are endless.
A. lipids
There are different forms of lipids. The one described in the question is called triglyceride.