Ahydrogen fuel cell is more efficient than a combustion reaction because very little of the released energy is released as when used at home a fuel-cell illuminates the need for because the cell is portable

1. A hydrogen fuel cell is more efficient than a combustion reaction because very little of the released energy is released as HEAT. 

We need more energy emit as light and less heat. Lesser the heat more the efficiency.

2. when used at home a fuel-cell illuminates the need for an electrical grid because the cell is portable.

As said, it is portable.

This is s cute awee : (( . well if she's showing you signs that she may like you , then shoot your shot ! don't be afraid . & if you're unsure that she's giving you these signs , then wait out for a little bit . most girls are different . some may act really sweet , but only bc you're a good friend of hers . that , or she might like you . you just never know . but i think you should sit down with her & tell her how you feel . but don't be awkward & shy . just be straight up & tell her how you feel . if the feelings aren't mutual , then don't cry about it . you need to respect her decision & look for others in the world . feelings can be difficult & confusing , but don't be afraid to show them . i say you play it out & if you're still unsure about it , talk to her . - rach