But one is assuming that they are based on polar compounds, surely non-polar compounds such as oils and alkalis rather than amino acids, if one abandons the norms of terrestrial biochemistry, surly the possibility of non-polar life exists.

The mercury is the fluid that facilitates their bodily functions, in the same way in which the human body uses water.

These are biological not mechanical, Tortliena, the blade is similar to a cats claw.

So whilst Si based life forms are theoretically possible, it is impossible to make a comparison without a reference point, so at present this question is unanswerable?