Answer:
The common cold is spread in human either by direct contact with infected secretions from contaminated surfaces or by inhaling the airborne virus after individuals sneeze or cough. during night times ) can easily affect cold.
Explanation:
Ancient cyanobacteria released oxygen, <span>which assisted in creating the atmosphere as we know it today. The correct option among all the options that are given in the question is the fourth option or option "D". I hope that the answer has actually come to your great help.</span>
To maintain homeostasis<span> in the blood and extracellular fluid. The most important way that the pH of the blood is kept relatively constant is by </span>buffers<span> dissolved in the blood.</span>
