Answer:
Why do marathon runners collapse and die? Some of the reasons why marathon runners often collapse near the finishing line is because the build-up of lactic acid in the blood during the run triggers abnormal heart rhythms and also exhaustion, emotional stress, dehydration and heat stroke
The answer is c... good luck
Answer:
they are ions of their atom.
<em>[character limit thing]</em>
I don't know if this is the answer you're looking for but "Transporters" move molecules across membranes. Such as channel proteins and carrier proteins
