The answer would be ~sedimentary~
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XY is a male, and XX is a female.
The structural form of D-glyceraldehyde is shown in the picture. As you can see, the L-glyceraldehyde and the D-glyceraldehyde are isomers. The D-isomer has the OH placed at the right side of the structure. Thus, the right side, encased in a red box, is the structure for D-glyceraldehyde.
The answer is C. SiO2 :)))
Since oil is a lubricant to help parts work smoothly, the answer is A) it reduces wear due to friction.
Friction creates heat between parts. The oil not only lubricates, but helps absorb that heat.
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