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Physical barriers:

• skin to prevent entry of organisms into the bloodstream

• cilia lining the nasal passages / bronchi to prevent entry to lungs / remove mucus 

...

1. To convey the meaning "with"  (с) 2) After certain prepositions: за (behind), между (between), над (above), перед (in front of), под (beneath) 3) After certain verbs (заниматься (to practi...

This question can be broken up into two main parts, one you're probably familiar with from C1 + C2 and one which is newer. The first part relates to differentiating a compound function (where a function i...

(2x + 3) / (x² + 3x + 5)

First write down the series of numbers e.g.  8,  12,  16,  20.

Calculate the difference between each term in the series 12-8 = 4, 16-12 = 4,  20-16 = 4 This shows that the expression will begin wit...