Many species are found only on islands. Lemurs are found on Madagascar and kolas only in Australia which factor contributes the most to this situation

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.

answer; /// i believe the correct answer is (reactants);

currents is the correct answer.