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A species with one or more valence electron pairs that forms co-ordinate bonds with a metal ion. 

Alpha helices and Beta pleated sheets. 

There are a number of reasons why it is necessary to open and close the air vents. These include; allowing oxygen in, which is also necessary for respiration and allowing heat to escape. Closing the ai...

y is proportional to x² so this means y = A*x² for some constant A.

When y = 75, x = 5. Put these values in the formula above to find A:

75 = A*25