Normal microbiota colonize our skin, and areas of the digestive, genital, urinary, and respiratory systems. If disruption in the balance of normal microbiota occurs, opportunistic pathogens can cause illness. is defined as a disruption of normal microbiota balance.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

well, i believe that the answer is 2. : 3