Alocal wind is felt to be blowing from north to south at ground level. at the top of the convection cell, the wind is felt to be blowing
from east to west
from west to east
from north to south
from south to north

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

the tricuspid valve is present between right atrium and right ventricle