I believe it's a color dye from pants or a shirt that must have gotten wet and stained your clothes. You should take a shower to get rid of any dyes that are on your body - if you see a rash see the doctors. To get rid of the stain, use bleach and dip the clothing in wet water and let it air dry.
PET would be the best option as I shows function although CT scans can also show function
As a healthcare worker, Sarah should advocate for the patient's right regarding the reproductive rights. She should trust that every patient is capable of making sound and intelligent choices and that. decisions this deep is better made without interference. As a healthcare worker, she can offer to assist and better inform the patients.
A and C is not advocatable unless you want to get thrown in jail ._.
B is just a friend, but D is the right answer (good job!) because you want to support someone with special needs.
Diffusion.
diffusion acts passively, and the oxygen and carbon dioxide move to the area of lower concentration