If methods were developed to improve the efficiency and effectiveness of one system, what effect might that improvement have on the other systems?

Minor Malfunction: If the Excretory doesn't do it job, waste will begin to pile up in the body, ultimately leading to death.Improvement: If the respiratory cold take in more air, more blood would be transported to the brain. Which will make almost all senses feel sharper and will understand things more clearly.

The answer is c establishing proper sleep hygiene