B. Experiences can effect how you produce your level of physical activity <span />
because they work with a lot of people and they know when they see someone unhealthy
The answer to this is Plan a steady progression of exercise intensity.
If a proteins shape was changed it may be able to do its function to do being unable to fit in all blood vessels/arteries and the shape change may of hindered its capability of carrying nutrients it needs to transport, etc.
for example:
If a hemoglobin (red blood cell) shape changed, (this is normally called sickle cell) the red blood cell would be to unable to travel through the body with ease and easily clog bloodstreams. Also, the hemoglobin will not be able to transport as much oxygen throughout the body.
