10% of 50 is 5 I don’t know why I have to use 20 characters
You inhale when contracting muscles and exhale when finishing a rep.
Answer: 
Explanation: If a contestant steps beyond the edge (scratch line), his jump is disallowed; if he leaps from too far behind the line, he loses valuable distance. ... Beginning in 1948, the women's long jump has been an Olympic event.
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Not exactly sure but your teeth and saliva break down food before it becomes further broken down in the stomach(churning action and the stomach acid) it then passes to the small intestines as chyme. So with process of elimination it is definitely not C or D. So it is up to you to decide what counts as digesting. It is either A or B even though in real life both make sense