<h2>Answer:</h2>
<u>Natural gas is indoor pollutant</u>
<h2>Explanation:</h2>
From the options given above smog and vehicle exhaust are outdoor pollutants. Oxygen is not a pollutant at all. The only option left is natural gas. When we cook food or use heaters we use natural gas so the burning of natural gas pollutes the indoor environment that is why we can say that natural gas is indoor pollutants.
The hair cells are located in the basilar membrane.
Tom can reach his goal safely because he is prepared and committed to learning how to ride his skates. Toms being safe by signing up for a class, buying the right safety equipment, and trying to reach his goal by starting 2 months ahead of the summer.
