1:b revising 2:c proof reading 3:a checking for spelling errors 4:<span> D. a step by article about pet grooming written for pet lovers digest. 5: d editing/proofreading</span>
In this selection, the sentence seems to be using "the wind was our friend on the way back, though." as an indication that the wind might most likely not nearly as bad as it was when they started to go for a skate. Short explanation: It wasn't as bad as when they first started.
NaF is not covalent, but ionic, as Na and F are on opposite sides of the periodic table.
Millimeters (mm) since it is a very small measurement
