Explanation:
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What part of the bacterial cell helps it stick to surfaces
C, Since binary ionic compound is only of 2 elements. Mg is ionic and so i F so thats it. H20 is covalent B is more than 1 element, D looks dodgy, nah its dat ionic compunds wouldnt form big ones like SF (6)
You draw a straight line from the start point to the end point. It doesn't matter what route was actually followed for the trip.