In many mountain streams on the island of Trinidad, predatory live both above and below waterfalls.

Answer the above statement is correct (true);

There are no put the options so we can assist you ! put it on then i'll answer it ! did you not put the options on intentionally by any chance?

b.
the standard of living varies across the region.

The correct answer to this question is choice " m∠mnp = (x – y)"

far arc = x
near arc = y

angle mnp = (far arc - near arc) / 2
angle mnp = (x - y) / 2

from the given choices, it is assumed that there is a denominator of 2 that divides the whole expression.