What technological advances had positive impacts on diet and food distribution systems, but also had an adverse effect on the atmosphere when the system malfunctioned?

The refrigerator

Explanation:

The refrigerator is a major evolution in food distribution, because it has allowed food to be preserved and free from the action of microorganisms for a long time, so it can be distributed over many days while maintaining a quality standard. However, refrigerants showed an environmental problem when not working properly, because in cases of malfunctioning, the gases used in cooling could leak and cause damage to the ozone layer. But with the advancement of technology, the leakage of these gases has become less and less frequent.

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.