Just like humans and other animals, pathogenic bacterias also has the capability to evolve. These pathogens usually come to life as soon as they enter a host. When you use antibiotics, the majority of them will die, but several of them could survive. When these survivals replicate, it will creates more bacterias that has higher immune towards antibiotics compared to normal bacteria
The respiratory system works with the digestive and circulatory systems to make cellular respiration possible. During cellular respiration, your cells use oxygen and glucose to release energy. Carbon dioxide is a waste product of the process. Carbon dioxide must be removed from cells.
