Apattern of evolution that results when two unrelated species begin to appear similar because of environmental conditions is about the relationship between a dolphin and a shark).

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.

by drinking easy

very easy