It's the rows. They are periods. (1,2,3,4,5,6,7 - the ones without the letters).
Plant cells, along with every other cell, needs oxygen,carbon, and nitrogen. These are basically the elements every living cell needs to survive.
Plant cells also need sunlight for photosynthesis and produce sugar to convert that into food. <span />
Answer:
that would be true you place it outside the hexagon
Explanation:
A hydrogen fuel cell is more efficient than a combustion reaction because very little of the released energy is released as "Heat". <span>When used at home, a fuel cell eliminates the need for "An Electrical grid"
Hope this helps!</span>
