Hich sentence from the article shows the sweat-powered device's MAIN problem? Sweat is "one of the few available energy resources on skin," notes Seokheun Choi. Sweat is "one of the few available energy resources on skin," notes Seokheun Choi. Using sweat, he points out, lets people harness energy that usually goes to waste. Using sweat, he points out, lets people harness energy that usually goes to waste. The power these devices produce is quite low. The power these devices produce is quite low.

The power these devices produce is quite low.

Explanation:

The option selected above shows how energy devices powered by body sweat are not that good. This is because the power of these devices is very low, which results in low amounts of energy that are not powerful enough to be used efficiently and can reduce the use of non-renewable energies. The other options only have positive points about these devices, this being the only option that shows a problem.

the suction machine and tubing is the equipment that should be left behind and should be most easily accessible.