This is an illustration of the reflex arc.
The answer is T, True. Secondary pollutants are pollutants that we do not directly release, but that are created as a side effect of releasing primary pollutants, such as carbon dioxide, sulfur oxides, and particles such as ash and dust. Secondary pollutants include acid rain, ozone, smog, and CFC's (chlorofluorocarbons).
The average adult human body has about 60 billion cells
1000 kilocalories... it decreases by 10% as you go up