What term describes a new community replacing an existing community?
a.
primary succession
b.
climax community
c.
secondary succession
d.
seasonal succession
e.
ecological replacement

c, secondary succession. (i think)

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.