20 POINTS List and describe two internal influences and two external influences on physical activity.

Unlike  ct scans, which use x-rays,  mri scans  use powerful magnetic fields and radio frequency pulses to produce detailed pictures of organs, soft tissues, bone and other internal body structures.  differences between  normal and abnormal tissue is often clearer on an  mri  image than a  ct.you can see more with a mri scan. for example on an mri you can see internal bleeding.

Yes, most genetic diseases can not be cured. usually it can be treated. just like hereditatary prostate and breast cancer. so may i know what the choices are? the choices could not be found in your question. : )

A! i really hope that this u out